Here’s a question I’ve been trying to answer. If Obama’s orders and acts can be ignored because he isn’t really the president, how can he be removed? How do you remove as president someone who isn’t really the president?
I think what happens is SCOTUS rules on a 20th Amendment claim and decides that Joe Biden is to “act as President until a President shall have qualified”, as the 20th Amendment specifically states.
SCOTUS would have to decide whether someone who was never eligible to be President could actually become President. If he couldn’t actually become President, then there would be no need to impeach him.
If he could actually become President but was Constitutionally disabled from exercising the Presidential powers then Congress would have to impeach him to get rid of him.
SCOTUS would have to decide how the Constitution provides for the nation to get a President who qualifies in this case, that process would have to happen, and whoever finally qualified would then take over as President in Biden’s place.