Except that the president can literally just not enforce it. Andrew Jackson did it. He said fuck the Supreme Court lemme see them try to enforce that ruling. And they couldn't. And then he went on his merry way with some good, old-fashioned native slaughtering because the Executive Branch has plenary executive power. That's why it's called the Executive Branch. Plenty of presidents have done it. Obama did it with weed. That law is still in existence and is still not being enforced. If the chief law enforcement officer doesn't want to enforce the law he doesn't have to. That's how the republic works. The veto power is not the primary power separation between Congress and the Executive branch. I mean I'm not really here to debate legal fact. I took Constitutional Law in law school, I'm not stating my opinion. All executive branches of any republic have the power to not enforce laws that they think are unconstitutional or simply don't like. That is the check on Congress's power. Think about it. If there was only one police officer, would he arrest himself if Congress passed a fucked up law? Nope. The way you are describing it, Congress would be able to completely control the country with a supermajority party. They could pass a law saying the president goes to prison for doing his job and he would have to go to prison for existing. But, with the way it actually works, if this did get passed after a veto, the president would simply not enforce the law.