President-elect Trump's vow to overhaul the Justice Department is often cast in sweeping, ominous language: He'd seek retribution against his enemies, back deportations of millions of undocumented immigrants,

Now the court’s opinion gives him a blank check for a second term. He would be largely free to pursue his enemies using the powers of federal investigators and prosecutors. At campaign rallies and social media posts, Trump threatened to go after his political foes if he returned to the White House.