They mean, to impeach the questionable president? That begs the question of whether the person qualifies to be a president. He could argue in turn that an accusation of becoming regarded as president by fraud rules out impeachment because then he’s not a president.
“They mean, to impeach the questionable president?”
I quoted the Court citing the Twelfth Amendment or 3 U.S.C. 15. Where do see anything about impeachment in that?