Use the power of the people. Recall these "officials" at the State level. As a last resort, petition the appropriate House with an overwhelming majority of signatures and ask for Expulsion hearings.
Subverting the will of the voter base should not be allowed.
https://www.thoughtco.com/can-members-of-congress-be-recalled-3368240
https://history.house.gov/Institution/Origins-Development/Discipline/
https://en.wikipedia.org/wiki/Expulsion_from_the_United_States_Congress