"If the partisan Dems ever tried to Impeach, I would first head to the U.S. Supreme Court," Trump wrote on Twitter. [Source]
Why? He should use his constitutional powers instead. He's way too sloooooow!
If the Dems want to bring him down via impeachment, they'll need a solid case to persuade the people he has committed high crimes and misdemeanors even though the Senate won't go along. Obstruction of nothing (make that obstruction of fraud) won't cut it. War crimes will.
It will mean the Dems have to turn over a new leaf, though. They'll have to stand against war crimes. I won't be holding my breath.