The Big I
We have a thoroughly Republican Congress and they would like to impeach the current Republican President almost as much as they would like to suffer the Mongolian fire torture. Nonetheless, I think that it's pretty likely that the President will not complete his term in office - not so much because of the misdeeds already committed as because of those he has yet to commit. This is a guy burning with resentment with next to no impulse control, an ignorant fellow with no self-awareness, who moreover is showing signs of incipient senility. Essentially all his troubles today are of his own making, caused or at least initiated by his lack of impulse control and terrible judgement.
My guess is that sooner rather than later his own terrible judgement, or perhaps his response to external events, will collapse his remaining support and send the Republican Congress heading him for the exits.