PresidentDonald Trumpsaidthe Supreme Court's decisionlimiting his ability to deport immigrants without a court hearing represents "a bad and dangerous day for America." Ina post on his Truth Social siteon May 16, Trump slammed thehigh court's ruling blocking his administration from using a 1798 wartime law to deport a group of Venezuelan migrants. The migrants argued who said they had not been given enough of a chance to contest their removal. The presidentinvoked the Alien Enemies Actin March when he designated a Venezuelan gang known as Tren de Aragua as a "foreign terrorist organization." Alleged gang members have since been deported to a mega-prison in El Salvador. In an unsigned opinion, the court said the migrants haven't had enough time or information to protect their rights. That's important, the court said, because the administration has previously said it can't bring back a man who was mistakenly deported to El Salvador. "The result of this decision will let more CRIMINALS pour into our Country, doing great harm to our cherished American public," Trump said in his post. "TheSupreme Court of the United Statesis not allowing me to do what I was elected to do." More:Called out by Trump for how he leads the Supreme Court, John Roberts is fine keeping a low profile Justices Clarence Thomas and Samuel Alito dissented, saying in part that the court didn't have the authority to weigh in at this stage. The majority opinion was unsigned. By invoking the Alien Enemies Act, the Trump administration "has tapped into vast powers never previously used for routine immigration enforcement," according toa report by the nonpartisan Migration Policy Institute. This article originally appeared on USA TODAY:Trump attacks Supreme Court after it blocks Venezuelan deportations