The decision to investigate Trump himself was an aggressive move by FBI officials who were confronting the chaotic aftermath of the firing of Mr. Comey and enduring the president's verbal assaults on the Russian Federation investigation as a "witch hunt," the Times reported.
Mueller is believed to be investigating whether Comey's firing and other actions amount to obstruction of justice by the president.
It was a tense time.
Law enforcement officials became so concerned by President Donald Trump's behavior in the days after he fired FBI Director James Comey that they began investigating whether he had been working for Russian Federation against USA interests, The New York Times reported Friday.
They were also motivated by his reported statements during a May White House meeting with visiting Russian officials that he had fired Comey because "he was insane, a real nut job".
She went on to say that Trump has "actually been tough on Russian Federation", unlike former president Barack Obama.
The Times reported that FBI investigators looked into whether Trump's actions could be considered a threat to national security.
Robert Mueller took over the investigation when he was appointed special counsel soon after Comey's firing.
The Times reported Friday that the probe looking into whether Trump was working for Russian Federation was later folded into Mueller's investigation.
Mr. Trump submitted his written answers to Mr. Mueller in November after months of negotiation between his legal team and the special counsel team. Apparently, the bureau's knowledge of the Trump Tower meeting, and Trump's July 2016 press conference request - "Russia, if you're listening, I hope you're able to find the 30,000 emails that are missing - wasn't enough to pull the trigger on an inquiry". But, added to everything already known about contacts between Trump associates and Russian individuals - all of which were initially denied - this raises multiple red flags. American intelligence agencies and Mueller have said Russian Federation was the source of hacked material released by WikiLeaks during the campaign that was damaging to Hillary Clinton's presidential effort.
That means Rosenstein may still be at the DOJ after President Trump's pick for attorney general, Bill Barr, is installed in his new role, pending Senate confirmation next week.
The report may also raise new questions for congressional investigators probing Russian meddling. He did not explicitly acknowledge the existence of the investigation of Trump to congressional investigators.