Several of Trump's public actions have called into question whether he sought to blunt or block the criminal probe, a line of inquiry that prosecutors began pursuing last year. He has repeatedly called the investigation a "witch hunt" that has unfairly sullied his administration and hampered his ability to accomplish his policy agenda. He fired FBI James Comey in May after Comey told Congress that the bureau was investigating possible coordination between the Trump campaign and the Russians. Trump was furious that Comey did not state that he was not personally under investigation, The Washington Post previously reported.