Actually traditionally the party in power loses Midterms for the last 150 years or so: So, the likelihood of this happening is 90% to 100%

So, it is very likely that Trump will be impeached as long as there are fair elections that actually happen in the U.S. 

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2026 Election

Trump predicts he will be impeached if Republicans lose the midterms

If Republicans aren't victorious, "I'll get impeached," Trump said.