President Dwight D. Eisenhower and Pope John XXIII are shown during a private audience at the Vatican, Dec. 6, 1959.
Popes and Presidents —
President Dwight D. Eisenhower and Pope John XXIII are shown during a private audience at the Vatican, Dec. 6, 1959.
AP Photo/Paul Schutzer, File
July 2, 1963, President John F. Kennedy and Pope Paul VI talk at the Vatican.
Popes and Presidents —
July 2, 1963, President John F. Kennedy and Pope Paul VI talk at the Vatican.
AP Photo/File
Oct. 4, 1965, Pope Paul VI and President Lyndon B. Johnson are seen during the Pontiff's visit to New York.
Popes and Presidents —
Oct. 4, 1965, Pope Paul VI and President Lyndon B. Johnson are seen during the Pontiff's visit to New York.
AP Photo/File
Sept. 28, 1970, President Richard Nixon talks with Pope Paul VI as they meet in the Vatican.
Popes and Presidents —
Sept. 28, 1970, President Richard Nixon talks with Pope Paul VI as they meet in the Vatican.
AP Photo/File
Jan. 1, 1975, President Gerald Ford with his wife Betty at the Vatican City with Pope Paul IV.
Popes and Presidents —
Jan. 1, 1975, President Gerald Ford with his wife Betty at the Vatican City with Pope Paul IV.
Rolls Press/Popperfoto/Getty Images
President Jimmy Carter, his wife Rosalynn and daughter Amy meet Polish Pope John Paul II in Rome, Italy, July 15, 1976.
Popes and Presidents —
President Jimmy Carter, his wife Rosalynn and daughter Amy meet Polish Pope John Paul II in Rome, Italy, July 15, 1976.
Keystone/Getty Images
Sept. 10, 1987, Pope John Paul II meets with President Ronald Reagan in the Vizcaya, a lavish mansion on Biscayne Bay, in Miami.
Popes and Presidents —
Sept. 10, 1987, Pope John Paul II meets with President Ronald Reagan in the Vizcaya, a lavish mansion on Biscayne Bay, in Miami.
AP Photo/Arturo Mari, File
May 27, 1989, President George H.W. Bush gestures while standing with Pope John Paul II in the papal library at the Vatican.
Popes and Presidents —
May 27, 1989, President George H.W. Bush gestures while standing with Pope John Paul II in the papal library at the Vatican.
AP Photo/Ron Edmonds, File
August 12, 1993, Pope John Paul II and President Bill Clinton walk the grounds of Regis University in Denver.
Popes and Presidents —
August 12, 1993, Pope John Paul II and President Bill Clinton walk the grounds of Regis University in Denver.
LUKE FRAZZA/AFP/Getty Images
President George W. Bush shakes hands with Pope John Paul II upon his arrival for a private meeting at Vatican June 4, 2004.
Popes and Presidents —
President George W. Bush shakes hands with Pope John Paul II upon his arrival for a private meeting at Vatican June 4, 2004.
First lady Laura Bush and President George W. Bush applaud as Pope Benedict XVI waves to the crowd at the White House during an arrival ceremony on April 16, 2008.
Popes and Presidents —
First lady Laura Bush and President George W. Bush applaud as Pope Benedict XVI waves to the crowd at the White House during an arrival ceremony on April 16, 2008.
Chip Somodevilla/Getty Images
President Barack Obama and First Lady Michelle Obama meet with Pope Benedict XVI in his library at the Vatican on July 10, 2009.
Popes and Presidents —
President Barack Obama and First Lady Michelle Obama meet with Pope Benedict XVI in his library at the Vatican on July 10, 2009.
Vatican Pool/Getty Images
President Barack Obama and Pope Francis exchange gifts during a private audience on March 27, 2014 at the Vatican.
Popes and Presidents —
President Barack Obama and Pope Francis exchange gifts during a private audience on March 27, 2014 at the Vatican.
GABRIEL BOUYS/AFP/Getty Images