In the days after President Trump fired then FBI director James B. Comey, the FBI became so concerned by his behavior that they opened a counter intelligence investigation into whether he was working for Russia, the New York Times reports. Counterintelligence investigators for the FBI were considering whether the president’s own actions constituted a possible threat to national security. Two instances in which Trump publicly tied the Comey firing to the Russia investigation reportedly helped prompt the counterintelligence aspect of the inquiry, which was taken over by Special counsel Robert Mueller when he was appointed days after Comey was fired. It is unknown if Mueller is still pursuing the counterintelligence angle.