Referencing his recent encyclical on the environment, "Laudato Si’," Francis called for "a courageous and responsible effort to ‘redirect our steps’ … and to avert the most serious effects of the environmental deterioration caused by human activity."  

As for coping with the worst refugee crisis since World War II, Francis urged compassion, not hostility.

"We must not be taken aback by [migrants’] numbers, but rather view them as persons, seeing their faces and listening to their stories, trying to respond as best we can to their situation – to respond in a way which is always humane, just and fraternal," he told Congress.

After the speech, Francis went onto the Capitol balcony to address thousands gathered below. Speaking in Spanish, he said, "I'm so grateful for your presence. The most important ones here, children, I'll ask God to bless them."

Standing next to him, U.S. House Speaker John Boehner dabbed at his eyes with a handkerchief, overcome with emotion.

Francis concluded his remarks in English, saying, "Thank you very much and God bless America." The crowd erupted in boisterous cheers.

After leaving the Capitol, Francis spoke to roughly 400 people at St. Patrick's Church in downtown Washington, addressing parishioners, people served by Catholic Charities and choirs from two local high schools.

He called for charity and compassion toward the homeless and the least fortunate. And he said there is no social or moral justification for a lack of housing for the people.