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Only in so much as the Supreme Court decides that it is “legal”.
So the details are that the Supreme Court left it open to interpretation as to what could be considered an “Official Act”. If the Supreme Court decides your murder spree is an “Official Act” you are good to go.
So if the Supreme Court Justices are conservative when Biden goes to trial, then yes, he can be found guilty.
Oh yeah, he could kill them all and then appoint a bunch of new very brave conservative justices.
It’s highly unlikely, but it’s funny to think about.