*PALM MY FACE*
It seems like you don't understand about what I was saying.
I'm saying that court is only way to handle the law whichever is constitutional or unconstitutional by interpret the constitution. US Supreme Court is final court to rule it. For example, if the congress wants to shut USPS down and someone think it is unconstitutional to shut USPS down so will challenge in the court.
You don't have to give a second to thinking someone would shut down the USPS nor some individual changing the Constitution. The court does not become involved at all until Congress, the whole not an individual, makes the change. So to even think some one (i.e. The Postmaster, the President) can shut down the USPS is plain silly.