A marcher hold a sign that reads "Love is Love is Love" on the National Mall with the Washington Monument in the background during the Equality March for Unity and Pride in Washington, Sunday, June 11, 2017.

Image Credit: (AP Photo/Carolyn Kaster)

WASHINGTON - In the nation's capital, and dozens of other cities across the U.S., supporters of LGBT rights mobilized for marches and rallies Sunday, celebrating their gains but angered over threats to those advances.

The centerpiece event, the Equality March in Washington, was endorsed by virtually every major national advocacy group working on behalf of lesbian, gay, bisexual and transgender Americans. Leaders of those groups have been embittered by several actions of President Donald Trump's administration — including the rollback of federal guidance advising school districts to let transgender students use the bathrooms and locker rooms of their choice.

The activists also complain that Trump, although he campaigned as a potential ally of gays and lesbians, has stocked his administration with many foes of LGBT-rights advances, including Vice-President Mike Pence, Attorney General Jeff Sessions, and Health and Human Services Secretary Tom Price.

Throngs of marchers, many thousands strong, paraded past the White House and toward the Capitol, trailing behind a giant rainbow flag near the head of the procession.

"We're here, we're queer, get that Cheeto out of here," was among the chants directed at Trump.

For the LGBT community nationwide, it's an emotional time. Monday is the anniversary of the mass shooting a year ago in Orlando, Florida, that killed 49 people — mostly Latinos — at Pulse, a gay nightclub.

Among the marchers in Washington was Gil Mendez, a Puerto Rican native who travelled with his partner all the way from San Francisco to join the parade. He carried a sign that included the names of all the Pulse victims.

"The attack on Pulse really struck me hard," he said. "It made the connection between the physical violence of guns and the political attacks on our community."

Also marching, and singing freedom songs and patriotic songs along the way, were scores of members of gay choruses from various cities.

"It's an opportunity to tell everyone we're still here, and we're not going away at all," said Gregory Elfers of Teaneck, New Jersey, who was with a contingent from the New York City Gay Men's Chorus.

"We have to be heard — we have to be sure we're not trampled on," said L. Owen Taggart of Washington's Gay Men's Chorus.

Roughly 100 marches and rallies were planned across the U.S., including the first-ever gay pride parade in Grosse Pointe, a prosperous Detroit suburb. The one-mile (more than 1.5-kilometre) march began at Grosse Pointe South High School to emphasize support for teens who are gay or transgender.

Two 15-year-old marchers, Jessica Dodge and Shekinah Aho, held hands and wore shirts that said, "Make America Gay Again."

In Los Angeles, where the annual pride parade was renamed the ResistMarch, tens of thousands of people turned out to march in Hollywood, some carrying rainbow flags or signs reading "Love trumps hate." Speakers at the event included Mayor Eric Garcetti and RuPaul, the host of "RuPaul's Drag Race."

Chad Morgan told KABC-TV he was inspired by gay parents walking with their children.

"There are rights all across the board that are in jeopardy, that we need to show that we will fight for in America," Morgan said.

Among the activist leaders on hand in Washington was Sarah Kate Ellis, president of GLAAD, which monitors media coverage of the LGBT community.

She noted that Trump, breaking from the practice of Barack Obama, has declined to issue a proclamation in honour of Pride Month, and that the Trump administration has deleted questions about sexual orientation from planned federal surveys.

"If you look at their prioritization, we're really low on it," she said. "There absolutely is a resistance aspect to this march."

News from © The Associated Press, 2017