Then later in many aspects, supporting it with funding. Or in a vote as in an amendment claiming "that bill has some good parts to it". Allowing himself to be a part of a blackmail bill. Maybe he'll start claiming Russia made him do it next.
Really?
Really. The only time he supported one of these major mistakes was when he voted for the war in Afghanistan. He admitted he was wrong and owned up to it. It was one of the few times I've ever heard a politician flat out admit to making an error. That's one of the many things that sets him apart from the rest.