For the first time, the majority of cardinals to choose a pope are not from Europe, as Catholic demographics shift. But Europe remains the largest source of cardinals.

All of the 133 cardinals expected to take part in the secret conclave to elect a new pope have arrived in Rome, the Vatican said on Monday, with the race to succeed Pope Francis seen as wide open.

Two cardinals, Michael Czerny and Chibly Langlois, sat down with ABC News to discuss the challenges facing the church that the new pope will have to face.