Pittsburgh police detectives are being ordered to bring riot gear to work to be prepared for protests that may break out in the event President Trump fires special counsel Robert Mueller.

Detectives on the city force were urged in an email to bring their 'full uniform' and 'protective equipment' to work until further notice because of what a commander in the force to prepare for a nearly spontaneous protest.

The email cites a potential 'large scale protest' in the city's central business district – but doesn't cite any specific intelligence information.

'We have received information of a potential large scale protest in the Centra Business District,' according to the email from commander Victor Joseph, which was published by WTAE.

BE PREPARED: Pittsburgh police detectives are being ordered to bring riot gear to work to be prepared for protests that may break out in the event President Trump fires special counsel Robert Mueller (above)

DON'T FORGET YOUR HELMETS: Riot police stand in line to wait instructions before the G20 protest begins on September 25, 2009 in Pittsburgh, Pennsylvania. Detectives are being urged to bring their gear in case of rioting linked to the possible firing of special counsel Robert Mueller

'The protest would be semi-spontaneous and more than likely happen on short notice,' according to the email.

'Beginning Thursday, all Major Crimes detectives are required to bring a full uniform and any issued protective equipment (riot gear) with them to work until further notice.'

The station spoke to Pittsburgh mayor Bill Peduto and confirmed police were preparing for 'possible protests over a potential Mueller firing,' and called the email 'precautionary.

Commander Joseph did not immediately respond to a message seeking comment.

The move comes as Trump has vented about the Mueller probe and begun going after the special counsel by name. Last week, FBI agents raided Trump's longtime personal attorney Michael Cohen, who is now under criminal investigation.

Trump has repeatedly branded Mueller's probe a 'witch hunt.' Among documents seized by agents are those relating to non-disclosure agreements Cohen negotiated with two women who claim they had affairs with Trump.

SUIT UP: Officers were urged to bring riot gear in the event of a riot

Donald Trump waves at crowds after a day at the golf course. He has been trashing special counsel Robert Mueller online

Special counsel Robert Mueller when he was FBI Director

Trump tweeted in March: 'The Mueller probe should never have been started in that there was no collusion and there was no crime. It was based on fraudulent activities and a Fake Dossier paid for by Crooked Hillary and the DNC, and improperly used in FISA COURT for surveillance of my campaign. WITCH HUNT!'

Senate Majority Leader Mitch McConnell of Kentucky trashed a bipartisan Senate effort to protect Mueller's job as not 'necessary,' closing off one avenue which might have insulated the man overseeing the probe of Russian interference in the U.S. elections.

'I don't think he should fire Mueller and I don't think he's going to,' McConnell told Fox News on Tuesday. 'So this is a piece of legislation that isn't necessary in my judgment.'

McConnell even used language that entwined the decision with his own leadership.

'I'm the one who decides what we take to the floor, that's my responsibility as the majority leader, we will not be having this on the floor of the Senate,' McConnell said.

According to Moveon.org, 350,000 people have signed up for more than 800 emergency 'Nobody Is Above the Law' rallies around the country in the event Trump fires Mueller.