Sadly, just getting arrested and convicted for lying doesn’t remove him from Congress:
They shall in all Cases, except Treason, Felony and Breach of the Peace, be privileged from Arrest during their Attendance at the Session of their respective Houses, and in going to and returning from the same;
I’m pretty sure the GOP would rather have him appear in manacles and an orange jump suit every day Congress is in session for the rest of Santos’ term than risk giving up a seat.