I think he had no choice to fire Comey (as to timing not sure if it would have made a difference to the media), especially when Comey wouldn’t tell the public that he wasn’t under investigation and thereby spurring on the media with their spurious Russia/Trump narrative, although, he did state that the NYT story which started the ball rolling was false:
He didn’t have any choice? Oh, please. That is ridiculous.
**May 9: **Comey is fired. White House statement: “Today, President Donald J. Trump informed FBI Director James Comey that he has been terminated and removed from office. President Trump acted based on the clear recommendations of both Deputy Attorney General Rod Rosenstein and Attorney General Jeff Sessions.”
May 10, Sarah Huckabee Sanders statement: "There’s also another nugget of big news, as you guys may have been paying attention, in regard to the termination of the former FBI Director Comey. The President, over the last several months, lost confidence in Director Comey. The DOJ lost confidence in Director Comey. Bipartisan members of Congress made it clear that they had lost confidence in Director Comey. And most importantly, the rank and file of the FBI had lost confidence in their director.
Accordingly, the President accepted the recommendation of his Deputy Attorney General to remove James Comey from his position. Before the news broke, the President spoke to several members of Congress to inform them of his decision. Those members are Senate Majority Leader Mitch McConnell, Speaker of the House Paul Ryan, Senator Chuck Grassley, Senate Minority Leader Chuck Schumer, Senator Feinstein, Senator Lindsey Graham, House Majority Leader Kevin McCarthy, House Minority Leader Nancy Pelosi, and Congressman Bob Goodlatte. Later in the evening, he also spoke to Senator Bob Corker, Chairman of the Senate Committee on Foreign Relations…"
May 10, Nancy Pelosi: “*The President’s sudden and brazen firing of the FBI Director raises the ghosts of some of the worst Executive Branch abuses. We cannot stand by and watch a coverup of the possible collusion with a hostile foreign power to undermine American democracy.
“The interests of justice demand Congress act immediately to create an independent, bipartisan commission to pursue the Trump-Russia investigation free from the Administration’s attempts to silence it*.”
**May 11: **Trump Interview with Lester Holt:
Holt: Monday you met with the Deputy Attorney General Rod Rosenstein.
Trump: Right.
Holt: Did you ask for a recommendation?
Trump: What I did is, I was going to fire Comey. My decision. It was not —
Holt: You had made the decision before they came in the room.
Trump: I was going to fire Comey. There’s no good time to do it, by the way.
Holt: Because in your letter you said, “I accepted their recommendation.”
Trump: Well, they also —
Holt: So, you had already made the decision.
Trump: Oh, I was going to fire regardless of recommendation.
Trump went on to say (in part): …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, its an excuse by the Democrats for having lost an election they should have won…"
In other words, Trump made up a bunch of stuff about lost confidence in the FBI director and low morale and implies pressure from Congress, but in fact he didn’t want the FBI investigating him any more, so he fired Comey. When the announcement was made, he tried to imply someone was pressuring him to fire Comey when he was in fact going to fire Comey no matter what anyone else said. Or maybe something else is the truth. Once someone has told two conflicting stories about a course of events, who knows if either one of those is even true?
He fired Comey because he wanted the investigation into anything having to do with himself and Russia to stop. I don’t care what the legal definition of obstruction of justice is. Donald Trump fired Comey primarily to stop an investigation into Trump and his aides. He made the decision all by himself. He attempted, however, to imply he made his decision based on independent recommendations and outside pressures. That isn’t true, even by Mr. Trump’s own account. The White House said the President fired Comey because Comey had lost the confidence of Congress and the rank and file in the FBI, but again, by Trump’s own account, that is not why he decided to fire Comey. Trump said he made the decision because he thought the investigation ought to be stopped.
By these actions, he asked for an independent prosecutor to take over the investigation. Really, what did he expect? I can believe Nancy Pelosi just said, “I understand. I’m sure your mind is made up. Thank you for calling.” If he made all the phone calls he did, however, then it was pure passive aggression if every Republican and every other lawyer he talked to did not explain exactly what he ought to expect to follow.
So no, he was not “forced” to fire Comey before the investigation was concluded. That is nonsense. If he had any common sense, he would have either fired Comey on Day One but made no attempt to do anything about any investigation into his activities or else waited until the investigation was over. He provided the impetus to appoint a special prosecutor all by himself, and he has himself to thank for it.