Biden ordering ground and air troops on Texas in order to support illegals crossing the border would be the breaking point. We have a corrupt President who is beholden to the Chinese and globalists who simply does not care about American citizens anymore.
First he would try to twist it as just an action against a rogue faction who are in defiance of a USSC decision. Just enforcing law and order you know. Somehow the right has to be ready to combat against that in the propaganda war that they usually lose.