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Top row, from left: President John Kennedy and Pope Paul VI in 1963 (CNS file photo); Paul VI and President Lyndon Johnson in 1967 (CNS/LBJ Library/Yoichi Okamoto); President Barack Obama and Pope Francis in 2014 (CNS/Stefano Spaziani, pool). Bottom row, from left: President George H.W. Bush and Pope John Paul II in 1991 (CNS/Reuters/Rick Wilking); President George W. Bush and Pope Benedict XVI in 2008 (CNS/Reuters/Filippo Monteforte); President Donald Trump and Francis in 2017 (CNS/Paul Haring).