State attempts to reign in permanent Senators and Congresscritters via term limits and recall have been struck down by federal courts in the past. This will probably be viewed as judicially similar in nature. In regard to election fraud the best you can do is get a state (Forget federal with the new JustUs department) conviction on fraud and try and shame Congress into acting. It might also be “instructional” after the state conviction to file extradition papers to drag the critters ass home !
Almost certainly since nothing in the Constitution supports it.
Clearly you missed the removal of Congress persons by quo warranto in the past. Fraud vitiates everything. Congress critters elected with UNLAWFUL elections have no Constitutional 'right' to their seats in Congress, and your fantasies don't accommodate this landscape. And yes, this is based on the probability that election fraud can, and has already been presented.