Pope Francis gave President Donald Trump a copy of his landmark 2015 encyclical on climate change when the two leaders met at the Vatican on Wednesday.

The climate encyclical — titled “Laudato Si” or “Praise Be to You” — called for strong action on climate change, which Pope Francis warned would disproportionately impact developing countries. His meeting with Trump on Wednesday comes as the White House considers whether the U.S. should leave the Paris Agreement on climate change.

Secretary of State Rex Tillerson said a Vatican official on Wednesday encouraged the U.S. to remain in the Paris Agreement, according to White House pool reports. Tillerson called the discussion a “good exchange.”

Senate Minority Leader Chuck Schumer, meanwhile, urged Trump to pay attention to the encyclical’s message. “If President Trump reads the Pope’s writings, I’m confident he’ll not withdraw the agreement,” Schumer said Wednesday. “We gotta get him to read it.”