Former Speaker Newt Gingrich (R-Ga.) called for President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE to stop attacking special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE and to instead "focus on being president."

Gingrich on Monday was asked during an interview on Fox News if he thinks Trump is doing the right thing in targeting Mueller with a series of tweets.

"No, I don't think he's doing the right thing. ... The president ought to just drop this whole line of worrying about Mueller,” Gingrich said during the interview.

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“Focus on being president. Mueller is going to be taken care of. Mueller, in the end, is, I think, not going to have anything substantive about the president.”

Gingrich called for Trump to "quit doing this stuff."

"Focus on tweeting about things that move his presidency forward," he said.

"And just every time he starts to think about Mueller, quit thinking about him and go back to the presidency."

His comments come after Trump last weekend lashed out at Mueller over his probe into Russian election interference and potential ties between the Trump campaign and the Kremlin.

Trump is also adding prominent white-collar attorney Joseph diGenova to his personal legal team, the latest sign of an increasingly aggressive stance toward Mueller's investigation.

The former U.S. attorney has attacked the FBI and Department of Justice in conservative media outlets.

The White House is insisting there are no plans to fire Mueller.