I think they move for impeachment (at least hold hearings) for three reasons:
1. Their whackjob base demands it. (hatred)
2. The Fake News media demands it. (hatred and story/ratings)
3. The Donkeys ALWAYS overreach. (stupid)
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Well, that’s okay, then they will reap the whirlwind.
It looks like just the threat of it is enough already to get offered concessions from Trump via twitter.
So I expect them to play that angle. Plus some show investigations. The question is how much real teeth they will try to put into it.