It's worse than if they had done nothing. The legal case against Trump immunity is that he as President is making a deal with himself. The Roberts Court will 100% treat Blanche confirmation as de facto Congressional approval for the deal because of what Cornyn and Tillis did

Mike Nellis

Cornyn and Tillis folding on Blanche is the most predictable thing ever. They are cowards. The minute Blanche is confirmed, there’s nothing stopping him from reneging on this weaponization fund deal they’ve made. Vote for Democrats if you want a Congress that might actually stand up to this fascist.