Is declaring a given law “unConstitutional” anything other than a veto? Prior to Roe v. Wade, many laws existed limiting access to, or prohibiting outright, the murder/destruction of unborn fetuses.
All of those laws were vetoed, after they had been passed by duly elected representatives of the people, and signed into law by their Executives.
Again, I think a two thirds vote in Congress should be able to wipe any ruling from the books, and the President should have no say in it. As the most diffuse, heterogeneous body in our system of government, the bulk of the power was always intended to rest with Congress, particularly in domestic affairs.