The man was sworn in. That’s all that the Constitution requires.
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Except for one not so little problem - the U.S. Constitution - and its mandate on who is a legitimate president. There is no one or no event that can waive this mandate. Sneaking into office as an unqualified candidate makes him criminally guilty of the biggest fraud in all of mankind. He needs to spend the rest of his years behind bars as an example for anyone else who would try to run another such scam on the American people.
All I can saw is “Jeez, are we in trouble or what”?