The program on Saturday in Chicago includes music, prayer, speeches and Pope Leo’s first public address to an American audience.

"The commitment to building a safer world free from the nuclear threat must be pursued through respectful encounters and sincere dialogue," Leo said.

This article mentions details about sexual abuse. Reader discretion is advised. It’s been nearly a month since Pope Leo became the new bishop of the Catholic Church on May 8, 2025, following Pope Francis’ death on April 21.