While George Santos certainly isn't out of the woods with his impending federal trial and a House Ethics Committee investigation into his alleged campaign finance charges, the congressman was rightfully allowed to continue serving in the House. Every American is owed due process, and there's a reason why no representative has been expelled while their trial was still ongoing. Expelling Santos would have set a bad precedent, and his fate will be determined by the justice system in due course.
George Santos is arguably the most problematic member of Congress, yet he managed to survive expulsion despite members from his own party — and some Democrats — and state urging his removal. Santos deceived his constituents by lying about his education in addition to reprehensible fabrications about his grandparents surviving the Holocaust and his mother dying on 9/11. Now Santos faces criminal charges and a congressional investigation. That definitely sounds like sufficient grounds for expulsion.