In one ruling, the Supreme Court has delivered two major victories to President Trump. The first victory is obvious: Trump v. Hawaii validates the President’s broad authority to restrict entry of specified foreign nationals into the United States when the President finds such entry is “detrimental to the interests of the United States.” What does this mean? It means, as I have argued, that President Trump’s “travel ban” limiting immigration from Iran, Iraq, Libya, North Korea, Chad, Syria, Venezuela, and Yemen is constitutional. It means that President Trump does have the authority, despite the open-borders howls of liberals and illegal...