WASHINGTON — In her most brutal criticism yet, Hillary Clinton released a web video Thursday portraying Donald Trump as the candidate of the Ku Klux Klan, neo-Nazis and white supremacists, and warning that “if Trump wins, they could be running the country.”

The one-minute online video features white men identified as KKK members and white supremacists declaring their support for the Republican nominee.

“The reason a lot of Klan members like Donald Trump is because a lot of what he believes, we believe in,” says a white-robed man identified as the Imperial Wizard of the Rebel Brigade Knights of the Ku Klux Klan.

The video pans to images of the Confederate flag and a man raising a Nazi salute at an apparent Trump rally.

“These people support Trump because they believe Trump supports them,” the video declares to ominous music.

Another clip is from former KKK Grand Wizard David Duke. “Voting against Donald Trump … is really treason to your heritage,” Duke says as black and white images of Duke in a white robe appear.

Clinton also tied Trump’s new campaign CEO, Breitbart News chairman Steve Bannon, to the alt-right movement.

“There’s a reason the most hateful fringe of the right wing is supporting Donald Trump,” Clinton tweeted Thursday in advance of a speech in Reno at which she’s expected to call out Trump as an extremist.

A black pastor and Trump supporter, Mark Burns, denounced the video as “a disgusting new low” for Clinton.

“This type of rhetoric and repulsive advertising is revolting and completely beyond the pale,” Burns said in a statement released by the Trump campaign. “I call on Hillary Clinton to disavow this video and her campaign for this sickening act that has no place in our world.”