Former New Jersey Gov. Chris Christie (R) on Sunday warned that President TrumpDonald John TrumpCould Donald Trump and Boris Johnson be this generation's Reagan-Thatcher? Merkel backs Democratic congresswomen over Trump How China's currency manipulation cheats America on trade MORE's "hyperbolic" style could have consequences if he testifies for special counsel Robert MuellerRobert (Bob) Swan MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE's Russia investigation.

"One of the things that makes the president who he is is that he's a salesman, and salesmen at times tend to be hyperbolic," Christie said during a panel on ABC's "This Week."

"That’s OK when you’re working on Congress. It is not OK when you’re sitting talking to federal agents because, 18 U.S.C. 1001 is false statements to federal agents, that's a crime, that can send you to jail."

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Christie also said he doesn't think Trump should ever "walk into that room with" Mueller.

Mueller is currently investigating Russian election interference and possible ties between the Trump campaign and Russia. His team is reportedly discussing plans for him to interview the president with Trump's attorneys.

Trump has in the past dismissed the Russia probe as a "witch hunt" and has repeatedly denied collusion between his campaign and Russia.

Last month, Trump said he still wants to testify before Mueller in the ongoing probe. His announcement came after his lead attorney, John Dowd, resigned amid a broader shake-up of his legal team.

Trump has publicly and privately said he should sit down with the special counsel. He has long expressed a belief he should be able to deliver his argument personally to Mueller, which is that his campaign did not collude with Moscow's election-meddling efforts in 2016.