In this case a prisoner at Guantanamo Bay objected to his confinement
The US court system has the right to determine whether foreign nationals held in the camp are lawfully detained or not
Shafiq Rasul was a British captured by the US military in Afghanistan. He was then transported to Guantanamo Bay. He was released just before the ruling
A non governmental organisation had filed habeas corpus suits about these men in 2002
One of the vexatious issues arising from the case was the differential treatment accorded to non Americans.
Scalia was one of those who dissented and said that the court should not review the detention of foreigners.