(CNN)Here's a look at the 2020 presidential candidates and key dates in their campaigns.
Republican Candidates
Donald Trump - 45th President of the United States. Running for reelection.
Primary Campaign Committee - Donald J. Trump for President, Inc.
Website - https://www.donaldjtrump.com/
January 20, 2017 - The day he is inaugurated, Trump submits paperwork to the Federal Election Commission to be eligible to run for reelection in 2020.
February 27, 2018 - The Trump campaign announces Brad Parscale, the digital media director of his 2016 campaign, has been hired to run his reelection bid.
March 17, 2020 - Earns enough delegates needed to win the Republican nomination for president.
Primary Campaign Committee - Donald J. Trump for President, Inc.
Website - https://www.donaldjtrump.com/
January 20, 2017 - The day he is inaugurated, Trump submits paperwork to the Federal Election Commission to be eligible to run for reelection in 2020.
February 27, 2018 - The Trump campaign announces Brad Parscale, the digital media director of his 2016 campaign, has been hired to run his reelection bid.
March 17, 2020 - Earns enough delegates needed to win the Republican nomination for president.
Bill Weld - Former Massachusetts Governor
Primary Campaign Committee - 2020 Presidential Campaign Committee
Website - https://www.weld2020.org/
April 15, 2019 - Announces he is running for the Republican nomination for president on CNN's The Lead with Jake Tapper.
March 18, 2020 - Weld announces he is suspending his presidential campaign.
Primary Campaign Committee - 2020 Presidential Campaign Committee
Website - https://www.weld2020.org/
April 15, 2019 - Announces he is running for the Republican nomination for president on CNN's The Lead with Jake Tapper.
March 18, 2020 - Weld announces he is suspending his presidential campaign.
Joe Walsh - Former US Representative from Illinois
Primary Campaign Committee - Walsh 2020
Website - https://www.joewalsh.org/
August 25, 2019 - Announces he is running for the Republican nomination for president on ABC's "This Week."
February 7, 2020 - Walsh tells CNN's John Berman on "New Day" that he is ending his candidacy for president.
Primary Campaign Committee - Walsh 2020
Website - https://www.joewalsh.org/
August 25, 2019 - Announces he is running for the Republican nomination for president on ABC's "This Week."
February 7, 2020 - Walsh tells CNN's John Berman on "New Day" that he is ending his candidacy for president.
Mark Sanford - Former Governor of South Carolina
Primary Campaign Committee - Sanford 2020
Website - https://www.marksanford.com/
September 8, 2019 - Announces he will launch a primary challenge for the 2020 Republican nomination on "Fox News Sunday."
November 12, 2019 - Announces he is suspending his presidential campaign.
Primary Campaign Committee - Sanford 2020
Website - https://www.marksanford.com/
September 8, 2019 - Announces he will launch a primary challenge for the 2020 Republican nomination on "Fox News Sunday."
November 12, 2019 - Announces he is suspending his presidential campaign.
Democratic Candidates
John Delaney - US Representative from Maryland's 6th District
Primary Campaign Committee - Friends of John Delaney
Website - https://www.johnkdelaney.com
July 28, 2017 - In a Washington Post op-ed, Delaney announces he is running for president.
January 31, 2020 - Delaney announces that he is ending his 2020 presidential campaign.
Primary Campaign Committee - Friends of John Delaney
Website - https://www.johnkdelaney.com
July 28, 2017 - In a Washington Post op-ed, Delaney announces he is running for president.
January 31, 2020 - Delaney announces that he is ending his 2020 presidential campaign.
Andrew Yang - Entrepreneur, founder of Venture for America
Primary Campaign Committee - Friends of Andrew Yang
Website - https://www.yang2020.com/
February 2, 2018 - Announces he is running for president via YouTube.
February 11, 2020 - Announces he is suspending his presidential campaign.
Primary Campaign Committee - Friends of Andrew Yang
Website - https://www.yang2020.com/
February 2, 2018 - Announces he is running for president via YouTube.
February 11, 2020 - Announces he is suspending his presidential campaign.
Richard Ojeda - Former State Senator from Virginia
Primary Campaign Committee - Ojeda for President
November 12, 2018 - Announces he is running for president at the Korean War Veterans Memorial in Washington, DC.
January 25, 2019 - Announces he is suspending his campaign for president.
Primary Campaign Committee - Ojeda for President
November 12, 2018 - Announces he is running for president at the Korean War Veterans Memorial in Washington, DC.
January 25, 2019 - Announces he is suspending his campaign for president.
Julián Castro - Former Mayor of San Antonio, Texas, and former Secretary of Housing and Urban Development (HUD) under US President Barack Obama.
Primary Campaign Committee - Julián for the Future Presidential Exploratory Committee
Website - https://www.julianforthefuture.com/
January 12, 2019 - Officially announces he is running for president.
January 2, 2020 - Announces he is suspending his presidential campaign.
Primary Campaign Committee - Julián for the Future Presidential Exploratory Committee
Website - https://www.julianforthefuture.com/
January 12, 2019 - Officially announces he is running for president.
January 2, 2020 - Announces he is suspending his presidential campaign.
Tulsi Gabbard - US Representative from Hawaii's 2nd District
Primary Campaign Committee - Tulsi Now
Website - https://www.tulsi2020.com/
January 11, 2019 - "I have decided to run and will be making a formal announcement within the next week," the Hawaii Democrat tells CNN's Van Jones.
February 2, 2019 - Gabbard officially launches her 2020 presidential campaign at an event in Hawaii.
Primary Campaign Committee - Tulsi Now
Website - https://www.tulsi2020.com/
January 11, 2019 - "I have decided to run and will be making a formal announcement within the next week," the Hawaii Democrat tells CNN's Van Jones.
February 2, 2019 - Gabbard officially launches her 2020 presidential campaign at an event in Hawaii.
Kamala Harris - US Senator from California
Primary Campaign Committee - Kamala Harris For The People
Website - https://kamalaharris.org/
January 21, 2019 - Announces she is running for president in a video posted to social media at the same time she appears on ABC's "Good Morning America."
December 3, 2019 - Harris ends her 2020 presidential campaign.
Primary Campaign Committee - Kamala Harris For The People
Website - https://kamalaharris.org/
January 21, 2019 - Announces she is running for president in a video posted to social media at the same time she appears on ABC's "Good Morning America."
December 3, 2019 - Harris ends her 2020 presidential campaign.
Marianne Williamson - Author and activist
Primary Campaign Committee - Marianne Williamson for President
Website - https://www.marianne2020.com/
January 28, 2019 - Williamson formally launches her 2020 presidential campaign with a speech in Los Angeles.
January 10, 2020 - Announces she is ending her presidential campaign.
Primary Campaign Committee - Marianne Williamson for President
Website - https://www.marianne2020.com/
January 28, 2019 - Williamson formally launches her 2020 presidential campaign with a speech in Los Angeles.
January 10, 2020 - Announces she is ending her presidential campaign.
Cory Booker - US Senator from New Jersey
Primary Campaign Committee - Cory 2020
Website - https://corybooker.com/
February 1, 2019 - Releases a video announcing his candidacy, appears on the talk show, "The View," participates in multiple radio interviews and holds a press conference in Newark, New Jersey.
January 13, 2020 - Booker ends his presidential campaign.
Primary Campaign Committee - Cory 2020
Website - https://corybooker.com/
February 1, 2019 - Releases a video announcing his candidacy, appears on the talk show, "The View," participates in multiple radio interviews and holds a press conference in Newark, New Jersey.
January 13, 2020 - Booker ends his presidential campaign.
Elizabeth Warren - US Senator from Massachusetts
Primary Campaign Committee - Warren for President, Inc.
Website - https://elizabethwarren.com/
February 9, 2019 - Warren officially announces she is running for president at a rally in Lawrence, Massachusetts.
March 5, 2020 - Warren ends her presidential campaign.
Primary Campaign Committee - Warren for President, Inc.
Website - https://elizabethwarren.com/
February 9, 2019 - Warren officially announces she is running for president at a rally in Lawrence, Massachusetts.
March 5, 2020 - Warren ends her presidential campaign.
Amy Klobuchar - US Senator from Minnesota
Primary Campaign Committee - Amy For America
Website - https://www.amyklobuchar.com/
February 10, 2019 - Announces her presidential bid at a snowy, freezing outdoor event in Minneapolis.
March 2, 2020 - Klobuchar ends her presidential campaign.
Primary Campaign Committee - Amy For America
Website - https://www.amyklobuchar.com/
February 10, 2019 - Announces her presidential bid at a snowy, freezing outdoor event in Minneapolis.
March 2, 2020 - Klobuchar ends her presidential campaign.
Bernie Sanders - US Senator from Vermont
Primary Campaign Committee - Bernie 2020
Website - https://berniesanders.com
February 19, 2019 - Announces that he is running for president, during an interview with Vermont Public Radio.
April 8, 2020 - Announces he is suspending his presidential campaign.
Primary Campaign Committee - Bernie 2020
Website - https://berniesanders.com
February 19, 2019 - Announces that he is running for president, during an interview with Vermont Public Radio.
April 8, 2020 - Announces he is suspending his presidential campaign.
Jay Inslee - Governor of Washington
Primary Campaign Committee - Inslee for America
Website - https://jayinslee.com/
March 1, 2019 - Announces his presidential bid in a video.
August 21, 2019 - Announces he is suspending his presidential campaign.
Primary Campaign Committee - Inslee for America
Website - https://jayinslee.com/
March 1, 2019 - Announces his presidential bid in a video.
August 21, 2019 - Announces he is suspending his presidential campaign.
John Hickenlooper - Former Governor of Colorado
Primary Campaign Committee - Hickenlooper 2020
Website - https://www.hickenlooper.com/
March 4, 2019 - Hickenlooper launches his campaign with a biographical video entitled, "Standing Tall."
March 7, 2019 - Officially kicks off his campaign with a rally in Denver.
August 15, 2019 - Hickenlooper ends his bid for the Democratic presidential nomination.
Primary Campaign Committee - Hickenlooper 2020
Website - https://www.hickenlooper.com/
March 4, 2019 - Hickenlooper launches his campaign with a biographical video entitled, "Standing Tall."
March 7, 2019 - Officially kicks off his campaign with a rally in Denver.
August 15, 2019 - Hickenlooper ends his bid for the Democratic presidential nomination.
Beto O'Rourke - Former US Representative from Texas
Primary Campaign Committee - Beto for America
Website - https://betoorourke.com
March 14, 2019 - Announces his presidential bid in a video.
November 1, 2019 - Announces he is ending his presidential campaign.
Primary Campaign Committee - Beto for America
Website - https://betoorourke.com
March 14, 2019 - Announces his presidential bid in a video.
November 1, 2019 - Announces he is ending his presidential campaign.
Kirsten Gillibrand - US Senator from New York
Primary Campaign Committee - Gillibrand 2020
Website - https://kirstengillibrand.com/
March 17, 2019 - Officially declares her Democratic candidacy for president via YouTube.
August 28, 2019 - Announces that she is ending her campaign.
Primary Campaign Committee - Gillibrand 2020
Website - https://kirstengillibrand.com/
March 17, 2019 - Officially declares her Democratic candidacy for president via YouTube.
August 28, 2019 - Announces that she is ending her campaign.
Wayne Messam - Mayor of Miramar, Florida
Primary Campaign Committee - Wayne Messam for America
Website - https://wayneforamerica.com/
March 28, 2019 - Officially declares his Democratic candidacy for president in a video released to CNN.
November 20, 2019 - Messam announces that he is suspending his campaign.
Primary Campaign Committee - Wayne Messam for America
Website - https://wayneforamerica.com/
March 28, 2019 - Officially declares his Democratic candidacy for president in a video released to CNN.
November 20, 2019 - Messam announces that he is suspending his campaign.
Tim Ryan - US Representative from Ohio's 13th District
Primary Campaign Committee - Tim Ryan for America
Website - https://timryanforamerica.com/
April 4, 2019 - Announces his presidential bid during an appearance on ABC's "The View." The televised announcement came just minutes after Ryan's campaign website went live.
October 24, 2019 - Announces he is dropping out of the presidential race.
Primary Campaign Committee - Tim Ryan for America
Website - https://timryanforamerica.com/
April 4, 2019 - Announces his presidential bid during an appearance on ABC's "The View." The televised announcement came just minutes after Ryan's campaign website went live.
October 24, 2019 - Announces he is dropping out of the presidential race.
Eric Swalwell - US Representative from California's 15th District
Primary Campaign Committee - Swalwell for America
Website - https://ericswalwell.com/
April 8, 2019 - Announces he is running for president during a taping of the "Late Show with Stephen Colbert."
July 8, 2019 - Announces he is dropping out of the presidential race.
Primary Campaign Committee - Swalwell for America
Website - https://ericswalwell.com/
April 8, 2019 - Announces he is running for president during a taping of the "Late Show with Stephen Colbert."
July 8, 2019 - Announces he is dropping out of the presidential race.
Pete Buttigieg - Mayor of South Bend, Indiana
Primary Campaign Committee - Pete for America
Website - https://peteforamerica.com/
April 14, 2019 - Officially announces he is running for president during a rally in South Bend, Indiana.
March 1, 2020 - Announces he is suspending his presidential campaign.
Primary Campaign Committee - Pete for America
Website - https://peteforamerica.com/
April 14, 2019 - Officially announces he is running for president during a rally in South Bend, Indiana.
March 1, 2020 - Announces he is suspending his presidential campaign.
Seth Moulton - US Representative from Massachusetts' 6th District
Primary Campaign Committee - Seth Moulton for America
Website - https://sethmoulton.com/
April 22, 2019 - Announces, via campaign video, he is running for president.
August 23, 2019 - Announces that he is ending his presidential bid during a speech at the Democratic National Committee summer meeting in San Francisco.
Primary Campaign Committee - Seth Moulton for America
Website - https://sethmoulton.com/
April 22, 2019 - Announces, via campaign video, he is running for president.
August 23, 2019 - Announces that he is ending his presidential bid during a speech at the Democratic National Committee summer meeting in San Francisco.
Joe Biden - Former US Vice President
Primary Campaign Committee - Biden for President
Website - https://joebiden.com/
April 25, 2019 - Announces he is running for president in a campaign video posted to social media.
Primary Campaign Committee - Biden for President
Website - https://joebiden.com/
April 25, 2019 - Announces he is running for president in a campaign video posted to social media.
Michael Bennet - US Senator from Colorado
Primary Campaign Committee - Bennet for America
Website - https://michaelbennet.com/
May 2, 2019 - Announces his candidacy during an interview on CBS' "This Morning."
February 11, 2020 - Announces he is ending his presidential campaign.
Primary Campaign Committee - Bennet for America
Website - https://michaelbennet.com/
May 2, 2019 - Announces his candidacy during an interview on CBS' "This Morning."
February 11, 2020 - Announces he is ending his presidential campaign.
Steve Bullock - Governor of Montana
Primary Campaign Committee - Bullock for President
Website - https://stevebullock.com/
May 14, 2019 - In a video posted online, announces that he is running for president.
December 2, 2019 - Announces he is ending his presidential campaign.
Primary Campaign Committee - Bullock for President
Website - https://stevebullock.com/
May 14, 2019 - In a video posted online, announces that he is running for president.
December 2, 2019 - Announces he is ending his presidential campaign.
Bill de Blasio - Mayor of New York City
Primary Campaign Committee - de Blasio 2020
Website - https://billdeblasio.com/
May 16, 2019 - Announces he is running for president in a video posted to YouTube.
September 20, 2019 - Announces that he is ending his campaign.
Primary Campaign Committee - de Blasio 2020
Website - https://billdeblasio.com/
May 16, 2019 - Announces he is running for president in a video posted to YouTube.
September 20, 2019 - Announces that he is ending his campaign.
Joe Sestak - Former US Representative from Pennsylvania's 7th District
Primary Campaign Committee - Joe Sestak for President
Website - https://www.joesestak.com/
June 23, 2019 - Announces his candidacy in a video posted to his website.
December 1, 2019 - Announces he is ending his presidential campaign.
Primary Campaign Committee - Joe Sestak for President
Website - https://www.joesestak.com/
June 23, 2019 - Announces his candidacy in a video posted to his website.
December 1, 2019 - Announces he is ending his presidential campaign.
Tom Steyer - Former hedge fund manager and activist
Primary Campaign Committee - Tom 2020
Website - https://www.tomsteyer.com/
July 9, 2019 - Announces his candidacy in a video posted online.
February 29, 2020 - Announces he is ending his presidential campaign.
Primary Campaign Committee - Tom 2020
Website - https://www.tomsteyer.com/
July 9, 2019 - Announces his candidacy in a video posted online.
February 29, 2020 - Announces he is ending his presidential campaign.
Deval Patrick - Former Governor of Massachusetts
Primary Campaign Committee - Deval for All
Website - https://devalpatrick2020.com/
November 14, 2019 - Announces his candidacy in a video posted to his website.
February 12, 2020 - Announces he is ending his presidential campaign.
Primary Campaign Committee - Deval for All
Website - https://devalpatrick2020.com/
November 14, 2019 - Announces his candidacy in a video posted to his website.
February 12, 2020 - Announces he is ending his presidential campaign.
Michael Bloomberg - Former New York Mayor
Primary Campaign Committee - Mike Bloomberg 2020
Website - https://www.mikebloomberg.com/
November 24, 2019 - Officially announces his bid in a letter on his campaign website.
March 4, 2020 - Bloomberg ends his presidential campaign.
Primary Campaign Committee - Mike Bloomberg 2020
Website - https://www.mikebloomberg.com/
November 24, 2019 - Officially announces his bid in a letter on his campaign website.
March 4, 2020 - Bloomberg ends his presidential campaign.
