Well, we should at least be able to point to Trump's own words in the Lester Holt interview: He [Rosenstein] made a recommendation, he’s highly respected, very good guy, very smart guy. The Democrats like him, the Republicans like him. He made a recommendation. But regardless of [the] recommendation, I was going to fire Comey. Knowing there was no good time do it! And in fact when I decided to just do it I said to myself, I said, “You know, this Russia thing with Trump and Russia is a made up story, it’s an excuse by the Democrats for having lost an election that they should’ve won.” https://www.vox.com/2017/5/11/15628276/trump-comey-fired-russia As well, at yesterday's press briefing, the assistant press secretary seemed to admit firing Comey was to assist in ending the Russian probe: https://www.deathandtaxesmag.com/329632/sarah-huckabee-sanders-comey-obstruction/ During Thursday’s combative briefing, deputy press secretary Sarah Huckabee Sanders issued a curiously frank statement regarding the motivations behind President Trump’s dismissal of FBI Director James Comey. In the wake of Trump admitting that he was going to fire “showboat” Comey, “regardless” of DOJ nomination, Sanders also told the press corps that the administration hopes it will end the investigation into Russia’s involvement in the 2016 election. “We want this to come to its conclusion, we want it to come to its conclusion with integrity,” Sanders said in regard to the bureau’s Russia investigation. “And we think that we’ve actually, by removing Director Comey, taken steps to make that happen.” Multiple FBI insiders are claiming Comey was fired to end the Russian probe: https://www.independent.co.uk/news/...d-fbi-insiders-director-hillary-a7729691.html The New York Times is reporting that Trump invited Comey to dinner early in his term. At that dinner, Trump asked Comey 3 times if he would pledge his loyalty to Trump. He told Trump he could only pledge his honesty. Basically, Trump was requesting that Comey take a loyalty oath to Trump. I have read suggestions that Comey told people at the FBI that Trump made this request, and that that information should be leaked if Comey were ever fired.