Trump tweets he'll order Justice Department to investigate if FBI 'infiltrated' his campaign. The DOJ tries to defuse crisis.

On Sunday afternoon, President Trump signaled he will follow through with his threat to directly interfere in the Justice Department's investigations of his campaign and himself.

After Trump's tweet, which Jonathan Swan at Axios likened to "rolling a grenade into the Department of Justice," the Justice Department said Deputy Attorney General Rod Rosenstein had asked Inspector General Michael Horowitz to expand an ongoing review to "include determining whether there was any impropriety or political motivation in how the FBI conducted its counterintelligence investigation of persons suspected of involvement with the Russian agents who interfered in the 2016 presidential election," and any "evidence of potential criminal conduct" would be referred to "the appropriate U.S. Attorney."

Trump spent much of the weekend tweeting angrily about the investigation, now headed by Special Counsel Robert Mueller, following reports Friday night that a covert FBI and CIA informant who served in the Reagan, Ford, and Nixon administrations had approached three Trump campaign aides in 2016 after the FBI became concerned they might be acting as Russian agents.

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Analysts said Rosenstein is attempting to defuse a crisis some Trump allies say the president is creating to force Rosenstein to quit. Trump has the constitutional right to do this, but "I can't think of a prior example of a sitting president ordering the Justice Department to conduct an investigation like this one," University of Texas law professor Stephen Vladeck tells The New York Times. "That's little more than a transparent effort to undermine an ongoing investigation," and if Trump followed through on his threat, "it seems to me that the recipients of such an order should resign."