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Pope Francis (R) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as a welcome rest-stop for Obama during a six-day European tour dominated by the crisis over Crimea, and the US leader will doubtless be hoping some of the pope's overwhelming popularity will rub off on him.    AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
Pope Francis (R) speaks with US President Barack Obama during a private audience on March 27, 2014 at the Vatican. The meeting at the Vatican comes as a welcome rest-stop for Obama during a six-day European tour dominated by the crisis over Crimea, and the US leader will doubtless be hoping some of the pope's overwhelming popularity will rub off on him.    AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)

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Some Republicans hesitant about Pope's Washington visit

Pope Francis will be the first Pontiff to ever address a joint session of Congress. CNN's Jim Acosta reports.

Some Republicans hesitant about Pope's Washington visit

Pope Francis will be the first Pontiff to ever address a joint session of Congress. CNN's Jim Acosta reports.