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Just think, in a few cycles impeachment will just be a normal thing that happens to every person in office! Day one impeached because you're not the candidate the other party wanted.
I wish I had a more substantive comment than "lol," but LOL >

Is the precedent now set for impeachment whenever Congress doesn't like the policies of the Executive Branch? >

If this impeachment happens then yes, but I wouldn't say there is precedent already.