Hello everyone and welcome to Ammanpur. Here's what's coming up.

As a Catholic Church prepares for what comes after Pope Francis, historian Christopher Bolito warns,

expect the unexpected. Then a new threat to the Pope's environmental legacy from the Trump White House.

Rick Spinrad, former government

climate official, fears cutbacks put people's lives at risk. Also, as the war on Ukraine

grinds on, Russia expert Alexander Gabuov looks at how Putin's invasion changed the course of history.

And finally, we look back at Christian's conversation with acclaimed actor Jonathan Price, who portrayed Francis in the movie The Two Popes. Welcome to the program, everyone.

I'm Deanna Golodriga in New York, sitting in for Christian Amonpour.

Mourners are flooding into the Vatican to pay their respects to Pope Francis.

On Wednesday, he will lie in state at St. Peter's Basilica with the funeral mass on Saturday morning. It will be a final humble gesture by Francis. His remains placed in a simple casket, buried not in the Vatican, but at Santa Maria Maggiore in Rome, the church where Francis would pray before leaving on trips

abroad. World leaders from U.S. President Donald Trump to Ukrainian President Volodymyr Zelensky

will be there. Then, at a date to be announced, the conclave begins. 135 cardinals, all men,

all under the age of 80, most chosen by Francis, will sequester

themselves inside the Vatican to choose the next pope.

Their choice will determine whether the Catholic Church continues on the progressive path

set by Francis or moves in a more traditional direction.

For more on Francis' legacy and what comes next, let's bring in Christopher

Bolito. He's a historian at Keene University and author of 101 questions and answers

on popes and the papacy. Welcome to the program, Christopher. I won't ask you a hundred and one

questions, but we'll try to get as many as we can in. I spoke with you on Good Friday Friday just days before the passing of Pope Francis.

And we talked about his struggles with his health the last few months, having been in hospital

for so long, yet managing to be discharged and to address the crowd there on Easter Sunday.

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