THE PEOPLE WHO TOLD US NOT TO NORMALIZE TRUMP ARE DENORMALIZING AMERICA: Alan Dershowitz: Democrats Cannot Impeach Trump, and You Can’t Impeach Him After Leaving Office. “Congress has no power to impeach or try a private citizen, whether it be a private citizen named Donald Trump or named Barack Obama or anyone else.”

I should also note that they can’t disqualify him from running again. The penalty for impeachment only includes disqualification from offices of “trust or profit,” and as Josh Blackman and Seth Barrett Tillman demonstrated some time ago, those offices are appointed, not elected offices.