"...broken the law" - there's the catch that had served to let both parties off the hook over the years. If Santos was spinning yarns during his campaign (as many other politicians have done), then it would be hard to prove he violated any laws because he didn't lie under oath. The voters of NY3 had their say and the party won't overturn a certified election without evidence of a crime.Sad but true. However, Speaker McCarthy has said, “If for some way when we go through Ethics and he has broken the law, then we will remove him,..." (Source)
Also, removal from Congress is not just up to McCarthy. It takes a two-thirds vote to expel a member if the Ethics committee brings charges, and it's only happened five times in the history of the House. The number of politicians who have lied during their campaigns over the years is incalculable. Let him without sin cast the first stone.