As Ronnie Raygun used to say, “there you go again”…. invoking the “Constitution”, while in the same breath, ‘cherry-picking’ same. And if you don’t recognize the authority of the Supremes, or only when you feel like it, then you’re obviously ignoring Article Three which created ‘em.
It can tell a President that his actions are not allowed by the Constitution. It can tell Congress that a law it passed violated the U.S. Constitution and is, therefore, no longer a law. It can also tell the government of a state that one of its laws breaks a rule in the Constitution.
The Supreme Court is the final judge in all cases involving laws of Congress, and the highest law of all — the Constitution.