Actress Cynthia Nixon says if President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE fires special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, the commander in chief’s opponents must “take to the streets.”

“We must make the firing of Robert Mueller a stark line in the sand,” the former “Sex and the City” star said at a Monday event dubbed the People’s State of the Union, “and if Trump crosses it we must take to the streets as never before!”

Nixon was among the celebrity speakers at the anti-Trump event, scheduled the night before his first State of the Union address to Congress.

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The New York Times reported last week that in June Trump wanted to fire Mueller — who's leading the probe into Russian interference in the 2016 U.S. election — but ultimately backed off when White House counsel Don McGahn threatened to quit.

“[Russian President] Vladimir Putin, and [President] Donald Trump and his enablers in the GOP Congress may think they have us on the ropes,” Nixon, 51, told the crowd in New York. “They may think that our belief in true participatory democracy is waning, that we are complacent, that we are distracted, that we are just too beaten down from this horror show year we’ve had and the sickening prospect of three more like it,” the actress continued. “But we are here to prove them wrong!”

“There is no cavalry coming. We are the cavalry!” Nixon added to cheers.

“If we want our democracy back, we have to get out there ourselves and seize it.”

The People’s State of the Union, hosted by We Stand United, MoveOn.org Political Action and Stand Up America, featured a bevy of Trump critics, including “Spotlight” star Mark Ruffalo, actor John Leguizamo, director Michael Moore and actress Rosie Perez.