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Some of Trump’s allies are beginning to push for Congress to open an investigation akin to the Church Committee’s probe in the 1970s into executive branch abuses of intelligence agencies to conduct improper domestic security operations, according to people familiar with the discussions.

The Justice Department, meanwhile, is bracing to see exactly what, if any action, Trump orders them to take this week. There’s no evidence that the FBI installed an informant or spy in Trump’s campaign. The FBI did rely on an informant who was in contact with Trump associates, according to two U.S. officials who spoke on condition of anonymity.

Trump tweeted last week that reports suggest “there was indeed at least one FBI representative implanted, for political purposes, into my campaign.” The New York Times reported that agents sent an informant to talk to two of Trump’s campaign advisers but “only after they received evidence that the pair had suspicious contacts linked to Russia during the campaign.”

The Justice Department responded Sunday by asking its inspector general to expand an ongoing review to include whether “any impropriety or political motivation” was a factor in how the FBI conducted its counterintelligence investigation related to the Russia probe, spokeswoman Sarah Isgur Flores said.

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Deputy Attorney General Rod Rosenstein, who oversees the Russia probe now being run by Special Counsel Robert Mueller, said in a statement that “if anyone did infiltrate or surveil participants in a presidential campaign for inappropriate purposes, we need to know about it and take appropriate action.”