Trump Should 'Focus on Being President' and Stop Worrying About Mueller and the Russia Investigation, Gingrich Says

One of President Donald Trump's biggest supporters outside the White House, Newt Gingrich, has told his fellow Republican to stop spending so much time attacking Special Counsel Robert Mueller and to instead "focus on being president."

Related: Is Trump Copying Bill Clinton's Response to Monica Lewinsky Investigation to Discredit Mueller?

In recent days, Trump has intensified his criticisms of Mueller, who is leading the FBI investigation into Russian interference in the 2016 election and possible collusion with the Trump campaign. Only a select few Republicans in Congress have come forward to attempt to censor Trump's attacks, made largely on Twitter.

Gingrich, though, told Fox News on Monday that he thought Trump should "quit doing this stuff," in part because he claimed the special counsel was unlikely to dig up anything harmful to his presidency.

"No, I don't think he's doing the right thing," Gingrich said of Trump's recent comments on Mueller. "He has lots of things to tweet about. The president ought to just drop this whole line of worrying about Mueller. 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 added, in a message to Trump: "Focus on tweeting about things that move his presidency forward. Every time he starts to think about Mueller, quit thinking about him and go back to the presidency."

In recent days, Trump has called the investigation "a total witch hunt with massive conflicts of interest" and claimed that Mueller's team was made up of "13 hardened Democrats, some big Crooked Hillary supporters, and zero Republicans," asking "does anyone think this is fair?"

Trump's renewed focus on Mueller has prompted fears that the president could soon seek to dismiss the special counsel, although the White House has denied that such an action is being considered.

Gingrich, a former House speaker, wrote a book last year titled Understanding Trump, which featured a foreword from the president's son, Eric Trump. However, he has consistently cautioned Trump against firing Mueller.

Trump Should 'Focus on Being President' and Stop Worrying About Mueller and the Russia Investigation, Gingrich Says | U.S.