They won't outright cancel the elections but they will do things like send ICE to contested districts to harass law-abiding voters; pressure states to remove people from voter rolls and make it difficult if not impossible for them to re-register in time to be able to vote; and otherwise just scream fraud and cheating and stolen when they lose the House.

Exactly this.

Belarus has elections, technically. Are they legitimate and free from coercion? Not really…