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Even if Democrats capture both house and senate they would not have the votes to remove him from the office. And I don't believe it is possible for them to capture the senate as many republican senators are not up for re-election for 2 more years...

He will likely be impeached at some point, but he could also pardon himself and his inner circle before leaving office.

Or move to Russia.

That would not surprise me at all.

It is mid-term - so no.