The US is worried about west coast safety. They are worried the people Japanese ancestors will become spies, so they issued an exclusion order
Korematsu argued that it was unconstitutional because it discriminated against people of his race. He ordered that it violated the 5th amendment. It states no person should be deprived of life, liberty, or property without due process of law
The Supreme Court disagreed. The said in normal circumstances, racial discrimination is unconstitutional, but the situation during war with the Japanese was different. They claimed "Korematsu was not excluded... because of hostility to him or his race."
That case meant that during wartime, it was okay for the U.S. government to violate people's civil rights just because they looked like the enemy. Since then, this opinion met with severe disapproval.
Many people were concerned that people's rights would be violated just because they looked middle eastern. two american citizens being. held as "enemy combatants" challenged the government's right to keep them in prison without the opportunity to tell a judge their side of the story