Re: Umm, hang on..
I think if there's something there, and the FBI is able to make its case even relying on classified data so they can't prove it to the satisfaction of Trump voters (not sure if anything could, he might have been right about shooting someone on Fifth Avenue...) the adults in the room like McCain and even spineless Ryan will fall into line and there would be enough of them along with unanimous democrat support to impeach/convict. That would have happened to Nixon, had he not resigned, but I don't think anyone believes Trump would resign - he'd just lock himself in the oval office, watch Fox News, and tweet in anger, blaming everyone but himself, as the roll call vote went against him.
While the congressional republicans are pretty solidly behind him now, that's because he's their president and their way of getting their legislative aims accomplished. Most of them didn't want him as the nominee, and would probably vote today to remove him and elevate Pence to president if they could do it via secret ballot. They are currently afraid to criticize him for fear of angering the voters who have supported Trump from day one. However, there are enough house and senate republicans in districts/states with fewer Trump supporters who wouldn't have to worry about losing their seat to their anger who can act, while they allow their colleagues who fear such reprisals to make hollow statements of support for Trump even as they cooperate behind closed doors to insure the vote goes against him.
In the long run, anyone with presidential aspirations down the road is not going to want to see the party torn apart, and it isn't like ousting Trump would hand power to Hillary. They'll get Pence, who many of them would have preferred in the first place if they had the choice. Personally I despise Pence for his holier-than-thou attitudes, but at least he's smart, sincere and most of all not batshit crazy like Trump, so I'd consider him a massive upgrade for the oval office. He would probably take office with record high approval ratings, simply for not being Trump.