In other words, there is precedent that fraud vitigates, which means it makes void (like a void check) or annuls. In other words. The election would be null and void because of the extent of fraud. And there's only 2 ways to fix that. 1. Revote the whole thing, or 2. go to the House (based on State Legislators NOT current makeup proportions) and the Senate would pick the VP. Which is one reasons why they want the Senate. Can you imagine President Trump with VP Kamala Harris? It is theoretically possible I believe. Such a rare situation though.
Trump could be set aside and another Republican also chosen as well. I think the Senate also has one state one vote for the VP.
It might be done that way to mute the anger on both sides.
BZackly! The taint of fraud ruins all.