The announcement triggered a panic within South Korea, which moved quickly to accommodate President Donald Trump.
The court said the injunction amounted to a universal injunction by extending relief to a sweeping class of protesters and observers.
The Trump administration is in crisis mode after the killing of 37-year-old Alex Pretti in Minnesota, pouring gasoline on the issue of immigration.
Judge Jeffrey Pearlman ruled that New York's 11th Congressional District diluted the voting power of blacks and Hispanics.