"The #MarchForLife is so important. To all of you marching -- you have my full support!" President Donald Trump tweeted as thousands streamed onto the National Mall, within view of the White House.
The 44th annual anti-abortion march, billed as the world's largest "pro-life" rally, drew participants from all corners of the country exactly one week after Trump's inauguration.
"The unborn babies don't have a voice and someone has to stand up for what's right," said Katelyn Goodwin, 17, a high school student from Birmingham, Alabama who came to the march with her church youth group.
The crowd -- which included many school groups -- toted signs that said "I am the pro-life generation," "Defund Planned Parenthood" and "Babies can feel joy in the womb."
Trump has already cheered abortion foes just days into his presidency. On Monday, he signed a decree barring US federal funding for foreign NGOs that support abortion services.
Next Thursday, he is expected to announce his choice to fill an empty seat on the Supreme Court, a nominee who is widely expected to staunchly oppose abortion rights.
"I think people that normally just sat back and said, 'Yeah, I'm pro-life' are beginning to act on it a little more and be more vocal," Annette Vaske, a Catholic high school teacher from Algona, Iowa, said of the impact of Trump's election.
"They don't feel so threatened and intimidated. I think we just realized that there's more of us than we really think there are."
Several Republican lawmakers, New York Cardinal Timothy Dolan and other religious leaders are also scheduled to speak at the rally.
The march takes place days after the 44th anniversary of Roe v. Wade, the landmark Supreme Court decision that legalized abortion in 1973.
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