Hillary Clinton on emails: ‘I’m sorry’

Democratic presidential front-runner Hillary Clinton said Tuesday she is “sorry” for using a private email server, going further than ever before to express remorse for the controversy that has rocked her campaign.

“I’m sorry about that,” Clinton said in an at-times emotional interview onABC News’ “World News Tonight with David Muir,” acknowledgingthat she should have used separate accounts for work and personal business. “I take responsibility and I am trying to be as transparent as I possibly can.”

Clinton later issued a slightly different apology in the interview, saying she was “sorry that it has raised all these questions.”

The former first lady also posted a personal apology on Facebook Tuesday night, saying, “I wanted you to hear this directly from me: Yes, I should have used two email addresses, one for personal matters and one for my work at the State Department. Not doing so was a mistake. I’m sorry about it, and I take full responsibility.”

She also added, “I know this is a complex story. I could have – and should have – done a better job answering questions earlier. I’m grateful for your support, and I’m not taking anything for granted.”

It’s part of a full-court press by Clinton to move past the problematic issue that’s sent her poll numbers tumbling, and seemingly opened the door to a credible challenge by rival Bernie Sanders, and perhaps Vice President Joe Biden.

Though Clinton has taken responsibility for her exclusive use of a private email server during her time as secretary of state, she told The Associated Press on Monday in Iowa that she doesn’t need to apologize for her nagging email controversy because “what I did was allowed.”

Clinton defended her practices again on ABC, saying that everyone she emailed in the White House and Obama administration knew she used a private account. She also disputed that she ever traded information over email that was marked classified at the time.

RELATED: Hillary Clinton’s email controversy, explained

The Democratic front-runner got choked up at one point, when speaking of her late mother and how hard it is to campaign “24/7.”

“It’s something that just demands everything – physically, emotionally, spiritually,” she said. “I can have a perfectly fine life not being president.”

It was a moment reminiscent of when she teared up in the days before the New Hampshire primary in 2008, which some outsiders said contributed to her come-from-behind victory in the state.

Clinton also offered praise for potential rival Biden, who is mulling a 2016 bid.

“I think he could be a good president, there’s no doubt about that,” she said.

In an interview with MSNBC earlier this month, Clinton apologized for the “confusion” around her exclusive use of a private email server as secretary of state and took responsibility for the controversy, but declined to directly apologize for the email set up.

Hillary Clinton accepts the Democratic Party's nomination for president at the Democratic National Convention in Philadelphia on July 28, 2016. The former first lady, U.S. senator and secretary of state was the first woman to lead the presidential ticket of a major political party.

Before marrying Bill Clinton, she was Hillary Rodham. Here she attends Wellesley College in Massachusetts. Her commencement speech at Wellesley's graduation ceremony in 1969 attracted national attention. After graduating, she attended Yale Law School.

Rodham was a lawyer on the House Judiciary Committee, whose work led to impeachment charges against President Richard Nixon in 1974.

In 1975, Rodham married Bill Clinton, whom she met at Yale Law School. He became the governor of Arkansas in 1978. In 1980, the couple had a daughter, Chelsea.

Arkansas' first lady, now using the name Hillary Rodham Clinton, wears her inaugural ball gown in 1985.

The Clintons celebrate Bill's inauguration in Little Rock, Arkansas, in 1991. He was governor from 1983 to 1992, when he was elected President.

Bill Clinton comforts his wife on the set of "60 Minutes" after a stage light broke loose from the ceiling and knocked her down in January 1992.

In June 1992, Clinton uses a sewing machine designed to eliminate back and wrist strain. She had just given a speech at a convention of the International Ladies' Garment Workers Union.

During the 1992 presidential campaign, Clinton jokes with her husband's running mate, Al Gore, and Gore's wife, Tipper, aboard a campaign bus.

Clinton accompanies her husband as he takes the oath of office in January 1993.

The Clintons share a laugh on Capitol Hill in 1993.

Clinton unveils the renovated Blue Room of the White House in 1995.

Clinton waves to the media in January 1996 as she arrives for an appearance before a grand jury in Washington. The first lady was subpoenaed to testify as a witness in the investigation of the Whitewater land deal in Arkansas. The Clintons' business investment was investigated, but ultimately they were cleared of any wrongdoing.

The Clintons hug as Bill is sworn in for a second term as President.

The first lady holds up a Grammy Award, which she won for her audiobook "It Takes a Village" in 1997.

The Clintons dance on a beach in the U.S. Virgin Islands in January 1998. Later that month, Bill Clinton was accused of having a sexual relationship with former White House intern Monica Lewinsky.

Clinton looks on as her husband discusses the Monica Lewinsky scandal in the Roosevelt Room of the White House on January 26, 1998. Clinton declared, "I did not have sexual relations with that woman." In August of that year, Clinton testified before a grand jury and admitted to having "inappropriate intimate contact" with Lewinsky, but he said it did not constitute sexual relations because they had not had intercourse. He was impeached in December on charges of perjury and obstruction of justice.

The first family walks with their dog, Buddy, as they leave the White House for a vacation in August 1998.

President Clinton makes a statement at the White House in December 1998, thanking members of Congress who voted against his impeachment. The Senate trial ended with an acquittal in February 1999.

Clinton announces in February 2000 that she will seek the U.S. Senate seat in New York. She was elected later that year.

Clinton makes her first appearance on the Senate Environment and Natural Resources Committee.

Sen. Clinton comforts Maren Sarkarat, a woman who lost her husband in the September 11 terrorist attacks, during a ground-zero memorial in October 2001.

Clinton holds up her book "Living History" before a signing in Auburn Hills, Michigan, in 2003.

Clinton and another presidential hopeful, U.S. Sen. Barack Obama, applaud at the start of a Democratic debate in 2007.

Obama and Clinton talk on the plane on their way to a rally in Unity, New Hampshire, in June 2008. She had recently ended her presidential campaign and endorsed Obama.

Obama is flanked by Clinton and Vice President-elect Joe Biden at a news conference in Chicago in December 2008. He had designated Clinton to be his secretary of state.

Clinton, as secretary of state, greets Russian Prime Minister Vladimir Putin during a meeting just outside Moscow in March 2010.

The Clintons pose on the day of Chelsea's wedding to Marc Mezvinsky in July 2010.

In this photo provided by the White House, Obama, Clinton, Biden and other members of the national security team receive an update on the mission against Osama bin Laden in May 2011.

Clinton checks her Blackberry inside a military plane after leaving Malta in October 2011. In 2015, The New York Times reported that Clinton exclusively used a personal email account during her time as secretary of state. The account, fed through its own server, raises security and preservation concerns. Clinton later said she used a private domain out of "convenience," but admits in retrospect "it would have been better" to use multiple emails.

Clinton arrives for a group photo before a forum with the Gulf Cooperation Council in March 2012. The forum was held in Riyadh, Saudi Arabia.

Obama and Clinton bow during the transfer-of-remains ceremony marking the return of four Americans, including U.S. Ambassador Christopher Stevens, who were killed in Benghazi, Libya, in September 2012.

Clinton ducks after a woman threw a shoe at her while she was delivering remarks at a recycling trade conference in Las Vegas in 2014.

Clinton, now running for President again, performs with Jimmy Fallon during a "Tonight Show" skit in September 2015.

Clinton testifies about the Benghazi attack during a House committee meeting in October 2015. "I would imagine I have thought more about what happened than all of you put together," she said during the 11-hour hearing. "I have lost more sleep than all of you put together. I have been wracking my brain about what more could have been done or should have been done." Months earlier, Clinton had acknowledged a "systemic breakdown" as cited by an Accountability Review Board, and she said that her department was taking additional steps to increase security at U.S. diplomatic facilities.

U.S. Sen. Bernie Sanders shares a lighthearted moment with Clinton during a Democratic presidential debate in October 2015. It came after Sanders gave his take on the Clinton email scandal. "The American people are sick and tired of hearing about the damn emails," Sanders said. "Enough of the emails. Let's talk about the real issues facing the United States of America."

Clinton is reflected in a teleprompter during a campaign rally in Alexandria, Virginia, in October 2015.

Clinton walks on her stage with her family after winning the New York primary in April.

After Clinton became the Democratic Party's presumptive nominee, this photo was posted to her official Twitter account. "To every little girl who dreams big: Yes, you can be anything you want -- even president," Clinton said. "Tonight is for you."

Obama hugs Clinton after he gave a speech at the Democratic National Convention in Philadelphia. The president said Clinton was ready to be commander in chief. "For four years, I had a front-row seat to her intelligence, her judgment and her discipline," he said, referring to her stint as his secretary of state.

Clinton arrives at a 9/11 commemoration ceremony in New York on September 11. Clinton, who was diagnosed with pneumonia two days before, left early after feeling ill. A video appeared to show her stumble as Secret Service agents helped her into a van.

Clinton addresses a campaign rally in Cleveland on November 6, two days before Election Day. She went on to lose Ohio -- and the election -- to her Republican opponent, Donald Trump.

After conceding the presidency to Trump in a phone call earlier, Clinton addresses supporters and campaign workers in New York on Wednesday, November 9. Her defeat marked a stunning end to a campaign that appeared poised to make her the first woman elected US president.

Hillary Clinton's life in the spotlight

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Clinton’s aides have argued that she didn’t need to apologize, given what she did was allowed by the State Department, but Clinton’s answer on Tuesday seems further than she has gone before.

Clinton turned over 55,000 pages of emails to the State Department earlier this year, but the email controversy has not gone away, partly because of a congressional inquiry into the terrorist attacks in Benghazi has also focused on Clinton’s email set up.

David Axelrod, a former top campaign adviser to President Barack Obama, told CNN’s Wolf Blitzer on “The Situation Room” Tuesday that Clinton’s evolving answers on the subject have been costly.

“Her answers have evolved over time and have prolonged this story,” said Axelrod, who is a CNN senior political commentator. “She’s trying to bring this thing to an end so she can be heard on other subjects, but she needs a consistent answer.”

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