Former New Jersey Gov. Chris Christie (R) warned President Trump against firing special counsel Robert Mueller on Tuesday.

In an interview with ABC’s George Stephanopoulos, Christie said it would be “a big problem” if Trump overruled his advisers and directed Deputy Attorney General Rod Rosenstein to fire the special counsel.

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“You can’t fire the special counsel. You just can’t,” Christie said.

Christie, who served as a member of Trump’s transition team, added that many who surround the president worry his reaction to a no-knock raid Monday by FBI agents in the offices of his lawyer, Michael Cohen, could overstep boundaries.

“I think he does understand it,” he added, “but I think there’s lots of people who are concerned that his reaction to this may overcome what he’s already been told.”

Cohen’s offices were raided Monday for materials related to his 2016 payment to adult-film actress Stormy Daniels, who claims she had an affair with Trump. Cohen has admitted to the payment to Daniels, but denies it violated campaign finance laws.

Trump lashed out at the FBI on Monday following the raid, which he called a “disgrace” and an attack on the country. He also hinted that he was once again considering firing Mueller.

“It’s a real disgrace,” Trump told reporters at the White House. “It’s an attack on what we all stand for.”

“We’ll see what happens. … Many people have said ‘you should fire him,’” Trump added when asked if he will fire Mueller. “Again, they found nothing and in finding nothing, that’s a big statement.”