After President Trump fired former FBI Director James Comey, the FBI opened an investigation into whether Trump was secretly acting in Russian interests against the United States, The New York Times reported Friday evening, citing unnamed sources. The probe was specifically prompted by Trump's repeated public linkage of the firing to the investigation into Russian election meddling, and Special Counsel Robert Mueller took over the FBI inquiry when he was appointed. Trump responded angrily to the report on Twitter Saturday, describing it as a story of how "corrupt former leaders of the FBI, almost all fired or forced to leave the agency for some very bad reasons, opened up an investigation on me, for no reason & with no proof, after I fired Lyin' James Comey, a total sleaze!" In subsequent tweets, he defended the Comey firing and claimed Comey and Mueller are "best friend[s]."

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