Pope Francis Makes Historic Visit to the U.S.

"If we want security, let us give security," Pope Francis said just now.

Big applause for pope's mention of how we must protect "human life at every stage of development."

Climate change talk going on now:

"I call 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. I am convinced that we can make a difference," he said.

From ABC News' Ali Weinberg, who spotted a moment:

The pool cameras trained on Rep. John Lewis, who as a college-aged civil rights leader, helped lead an orderly march across the Edmund Pettus Bridge in Selma, Alabama, as Pope Francis read this line: “Here too I think of the march which Martin Luther King led from Selma to Montgomery fifty years ago as part of the campaign to fulfill his “dream” of full civil and political rights for African Americans.”

Lewis was visibly moved, as his neighbors sitting next to him rubbed his shoulders proudly.

Speaking against war:

"Here we have to ask ourselves: Why are deadly weapons being sold to those who plan to inflict untold suffering on individuals and society? Sadly, the answer, as we all know, is simply for money: money that is drenched in blood, often innocent blood."

From ABC News' David Wright, who was outside with the crowd of tens of thousands of people gathered on the lawn during the speech:

Just beyond the security barrier, an eclectic crowd is gathered here on the national mall.

Environmental groups have set up jumbotrons for people to watch and the atmosphere is a bit like a music festival but a bit more political and religious.

The crowd includes monks in robes, mothers, college kids church groups of every denomination and others. Bernie Sanders for President volunteers are passing out leaflets. These people share a concern for environment but also are here because of Francis' message of social justice.

On the balcony: Nancy Pelosi, Harry Reid, Mitch McConnell, Joe Biden, John Boehner and others

False alarm, not in English.

But he said he's excited to see "the most important ones here: children!"

Closing line in English:

"Thank you, thank you very much, and God Bless America!"

Speaker Boenher is streaming video from inside his office while the pope visits.

Click here to take a look behind the scenes.

Timing note: Pope Francis was two minutes ahead of schedule when he left the nunciature this morning, but now he's running late. He was scheduled to arrive at the Charitable Center of St. Patrick's Church and meeting with the homeless at 11:15 but he's already behind.

He's now addressing the crowd in Spanish, but noted that the crowd is going to hear a few statements-- one in Spanish and one in English.

"Like St Joseph, you may ask why are we homeless without a place to live?" Pope Francis says, while reflecting on how the Bible says that the Holy family was not allowed in when they were looking for a place to stay.

The pope gave the group a blessing and ended by saying "and please, don't forget to pray for me."

From ABC News' Brionna Jimerson in New York:

Day and Merton may be trending, but let's not forget who this visit is all about.

The two biggest hashtags being used throughout Pope Francis' visit are #PopeInDC and #PopeInUS, with their accompanying emojis.

As of 11:30 a.m. this morning, shortly after he wrapped up his speech to Congress, #PopeInDC had 96,719 mentions and #PopeInUS had 25,167.