Thousands of abortion opponents gathered in cold, blustery weather near the Washington Monument Friday and heard Vice President Mike Pence tell the annual March for Life that the Trump administration is determined to advance the fight against abortion.

The massive crowd, bearing flags, banners and placards, then flowed down Constitution Avenue, filling the street, and rallied at the Supreme Court building across from the Capitol.

“We will not grow weary,” he said in a 10-minute address to the assembled throng. “We will not rest, until we restore a culture of life in America for ourselves and our posterity,”

He said the administration is bent on ending taxpayer funding of abortion and abortion providers. And he said that “next week President Donald Trump will announce a Supreme Court nominee who will uphold the God-given liberty enshrined in our Constitution in the tradition of the late and great Justice Antonin Scalia.”

Scalia, a conservative associate justice of the Supreme Court, died last year.

“Life is winning again in America,” said Pence, who added that Trump asked him to speak at the rally. “That is evident in … the historic election of a president … who I proudly say stands for the right to life.”

Pence was the first U.S. vice president to address the rally in its history.

Bundled against a stiff wind, marchers from around the country descended on the northeast grounds of the monument.

Pence, who has called himself an “evangelical Catholic,” has long been a hero among anti-abortion activists and as governor of Indiana signed what was considered some of the strictest laws on abortion.

Also addressing the crowd was key Trump adviser Kellyanne Conway.

“I am a wife, a mother, a Catholic, counselor to the president of the United States of America and, yes, I am pro-life,” she said.

“This is a new day, a new dawn, for life,” she said.

The right to life “is not a privilege,” she said. “Its is not a choice. It is God-given. … This is a time of incredible promise for the pro-life, pro-adoption movement.”

“We hear you,” she told the crowd. “We see you. We respect you. And we look forward to working with you.”

This year, organizers believe they will see a surge of energy with the ascension of a president who is expected to move forward on anti-abortion policies, including defunding Planned Parenthood and appointing an anti-abortion Supreme Court justice.

“He’s pro-life,” Lynn Ray, coordinator of campus ministry at the Louisiana State University at Alexandria, said Friday as she stood on Constitution Avenue with a group from the university. “So that’s good for us.”

“Being that we’re Catholics, we’re very pro-life,” she said. “Every step we take, we take for an unborn baby,” she said. “We’re not persecuting anyone, of course, just marching for the babies.”

Madeline Runyan, 22, a senior at LSU, said she, too, was pleased with President Trump’s stance on abortion. “I’m very confident in what he’s doing to help this cause,” she said. “I’m really excited and optimistic.”

The rally began at around 11:45 a.m. Pence spoke shortly after noon. The march began at around 1 p.m., and the crowd moved east, past the Capitol, and toward the Supreme Court, where another large assembly had already gathered.

There were members of the clergy, as well as “Bikers for Life.”

Many marchers were in school and church groups, carrying posters – and a life-size cutout of Pope Francis. They sang, chanted and prayed.

Dan Kehoe doesn’t see the March for Life as a political statement, he views it as a religious one.

The 34-year-old from Taos, Missouri, was a chaperone on his daughter’s eighth-grade Catholic Church trip. They took a Greyhound bus for 22 hours for what they called a “pilgrimage” to Washington.

He saw news coverage of last week’s Women’s March on Washington and thought that was a political march about women’s issues. This, he said, is “completely different,” and is not about women’s rights, but human ones.

“It’s not just a woman’s choice, it takes two to make a child,” he said.

More than 200 people made the trip from his central Missouri church community with him, most of them children. He said he voted for Donald Trump, and is happy with his president’s performance so far.

“If the younger generation doesn’t speak up now, who will?”

Large groups are common at the march, characterized by matching hats or shirts.

One block-long mass of 200 teenagers from 30 churches and three Catholic high schools filled five charter buses and is only part of a 500-strong group from the Archdiocese of Mobile, Alabama.

“Remember, we are guests in this city and we’re going to be respectful,” called Adam Ganucheau, 30, has he and other youth leaders handed out 200 boxed Subway sandwiches. “We are pilgrims; we do not litter.”

The size of the group is typical, said Ganucheau, who has attended more than a dozen of these marches since 2001. But he senses an extra electricity.

“It’s historic that these kids will be able to say they heard and saw the vice president,” he said as the throng began to move, sandwiches in hand.

Ganucheau said he was encouraged to have an anti-abortion administration take office, although there are parts of the Trump agenda that concern him. In addition to opposing abortion, Ganucheau said his faith also led him to support equal wages, equal pay, a welcoming immigration posture and other progressive social causes.

“Being Catholic is more than being conservative or liberal,” he said. “We believe in treating all people with respect.”

Earlier, Jeanne Mancini, president of the March for Life, listed her four demands for Trump and the Republican-controlled Congress:

— Appoint an anti-abortion justice to the Supreme Court.

— Make the Hyde Amendment, which bans federal funding for many abortions in the United States, into a permanent law rather than the one-year provision that has been extended each year from 1976 to the present.

— Pass a law banning abortion nationwide after 20 weeks of pregnancy.

— Stop all federal funding for Planned Parenthood unless the organization were to somehow stop performing abortions.

The gathering comes a week after Trump’s inauguration and follows last Saturday’s massive Women’s March on Washington.

Asked about the Women’s March, Ray said:

“I’m all about women’s rights, except when it comes to the baby. I believe — it’s my opinion — but I believe a baby is a gift from God, and once the baby is a gift from God, it’s no longer your body, but there’s another body within. And that body has a right also.”

When march attendee Brianna Roberts, 21, of Reading, Pennsylvania, met her birth mother two years ago, she was upset to hear that relatives wanted the woman to abort her.

Her mother was 20, already had one child, and was getting by on food stamps, Roberts said. But when her mother went to a clinic seeking an abortion, she was told she was too far along for the clinic to perform one.

Her birth mother placed Roberts up for adoption. “She did the right and responsible thing,” Roberts said.

Roberts said she did not vote because she didn’t like either Trump or Clinton, but she is optimistic that Trump will advance anti-abortion policies.

“I thought this was going to be a really big year for policy change,” she said.

Francis Leung, 18, a college student from Naples, Florida, said he has attended the March for Life with his parents almost every year since “I was a little kid” in a stroller.

Now, at 18, six feet tall and a college freshman, he stood in the throng of demonstrators and grinned, saying, “I always look forward to it.”

Leung said he grew up in a devoutly Catholic family and has been hearing a strong anti-abortion message from his parents for as long as he can remember. His nine siblings — eight of whom came to Washington with him this week — have heard it, too.

“It’s a great movement, because it’s simple,” said Leung, a student at Ave Maria University in Florida. He was referring to the annual the March for Life. It’s simple, he said, because “every unborn child has a right to life.”

Like his brothers and sisters, Leung said, he was home-schooled. And a central theme of his education was this: “When two humans come together and produce a child, when they create a baby, that’s like, really, really big — it’s the most important thing in the world. Procreation. It’s what human beings were put on Earth to do.”

The first March for Life was held one year after the Supreme Court’s Roe v. Wade decision in 1973 that recognized a right to abortion nationwide. Subsequent marches have been held on or near the Jan. 22 anniversary every year since.

The first March for Life was held one year after the Supreme Court’s Roe v. Wade decision in 1973 that recognized a right to abortion nationwide. Subsequent marches have been held on or near the Jan. 22 anniversary every year since.

On Friday, the marchers chanted, “Hey, hey, ho ho, Roe v. Wade has got to go!”

Nationwide, 59 percent of Americans say abortion should be legal in all or most cases, the highest percentage since 1996, according to a 2016 Pew Research Center report.

Michael E. Ruane, Perry Stein, Steve Hendrix, Terrence McCoy, Paul Duggan, Tara Bahrampour, Joe Heim and Michael Chandler contributed to this report.