Hundreds of thousands sign up to protest if Trump fires Mueller
© Greg Nash

Hundreds of thousands of people are vowing to protest if President TrumpDonald John TrumpPentagon update to missile defense doctrine will explore space-base technologies, lasers to counter threats Giuliani: 'I never said there was no collusion' between the Trump campaign and Russia Former congressmen, RNC members appointed to Trump administration roles MORE fires special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE.

About 300,000 people have now signed up to march in more than 800 events across the country should Trump fire Mueller, The Guardian reported, citing MoveOn. Approximately 20,000 people have signed up in the past two weeks, the newspaper added.

MoveOn, which launched the drive last August, said on its website that Trump's firing of Deputy Attorney General Rod RosensteinRod Jay RosensteinLive coverage: Trump AG pick grilled on Mueller probe at confirmation hearing The Hill's Morning Report — No new negotiations as shutdown hits 25 days Democrat previews Mueller questions for Trump’s AG nominee MORE or Mueller — who is investigating Russia's election interference and possible ties between the Trump campaign and Russia — would create a constitutional crisis.

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"Our response in the hours following a potential power grab will dictate what happens next—whether Congress will stand up to Trump or allow him to move our democracy toward authoritarianism," the site says.

"That's why we're preparing to hold emergency 'Nobody Is Above the Law' rallies around the country, in the event they are needed—800+ of them and counting, in every state, with 300,000 RSVPs to date!"

A report earlier this week said Trump is considering firing Rosenstein after federal investigators raided the office of Trump's personal lawyer, Michael Cohen.

Officials told CNN that the No. 2 Justice Department official, who reportedly personally approved the FBI raid, is Trump's most likely target.

Under DOJ regulations, Rosenstein is the only person with the power to fire Mueller, if he has cause to do so, since Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsBudowsky: Senate must protect Mueller from Barr, President Trump Feinstein grappling with vote on AG nominee Barr Central American women fleeing domestic violence deserve refugee status MORE recused himself last year.

However, White House press secretary Sarah Huckabee Sanders said earlier this week the president believes he has the power to dismiss Mueller as well.

President Trump on Thursday pushed back against a New York Times report that said he tried to fire Mueller in December, calling the story "fake news from a biased newspaper."