Gingrich: Mueller’s Trump investigation will be a ‘personal vendetta’
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Former Speaker Newt Gingrich (R-Ga.) is accusing special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE of using his investigation into Russian meddling in the 2016 presidential election to wage a personal war against President TrumpDonald John TrumpJustice Department preparing for Mueller report as soon as next week: reports Smollett lawyers declare 'Empire' star innocent Pelosi asks members to support resolution against emergency declaration MORE.

"Mueller's running a left-wing, Democratic group. The lawyers he's hired have terrible records," Gingrich early Thursday said on "Fox & Friends." "So look carefully at Mueller, because now it's not going to be Russia. Now it's going to be a personal vendetta by Robert Mueller against the president of the United States."

Mueller was appointed last month to lead the Justice Department's investigation into Russian meddling, as well as possible collusion between the Trump campaign and Moscow.

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His appointment immediately drew praise from Democrats and Republicans, who hailed Mueller as a model law enforcement official and a fair investigator. 

But some Republicans, particularly allies of Trump, have soured on Mueller in recent weeks, as the scope of his investigation is said to be expanding.

The Washington Post reported last week that the probe had widened to include whether Trump sought to obstruct federal investigations into his associates and his campaign.

Some Trump allies have argued that Mueller is politicizing the investigation, pointing to his early hiring of prosecutors who have donated money to Democratic political candidates. 

Mueller has hired a number of Justice Department veterans to assist in the special counsel investigation, including Andrew Weissman, who led the department's Enron task force that prosecuted company executives, and James Quarles, an assistant special prosecutor in the Watergate case.

Critics have also cast Mueller's friendship with James ComeyJames Brien ComeyFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Dems seize on Times bombshell to push allegations of Trump obstruction Trump calls Andrew McCabe a 'poor man's J. Edgar Hoover' MORE, the former FBI director whom Trump abruptly fired last month, as a conflict that could compromise the Russia probe.