President Trump criticized the Supreme Court after it blocked his effort to deport alleged Venezuelan gang members.
The court's decision concerned the use of the 1798 Alien Enemies Act (AEA) to expedite deportations.
Trump claimed the court is preventing him from fulfilling his campaign promises.
The Supreme Court, in a 7-2 decision, stated that the alleged gang members were not given enough time to legally contest their removal.
Trump argued this ruling forces the government into a "long, protracted, and expensive Legal Process".
The AEA was previously used to detain Japanese-Americans during World War II.
Attorneys for the Venezuelans claim their clients are not gang members and were targeted based on tattoos.
The court temporarily blocked deportations on April 19, emphasizing the need for due process.
Justices highlighted that detainees were given roughly 24 hours' notice before removal, lacking information on how to contest it.
Conservative justices Thomas and Alito dissented, while Trump thanked them for their support.
The justices also noted the erroneous deportation of a Salvadoran man, whom the administration cannot return.
The court clarified it was not ruling on the legality of using the AEA for deportations.
They directed a lower court to examine the question expeditiously, emphasizing the need for adequate notice.
Three federal district court judges have ruled Trump's use of the AEA unconstitutional.
Trump invoked the AEA, claiming TdA was engaged in "hostile actions" against the US.
Since taking office, Trump has taken measures to secure the border and combat gangs.