He doesn't mince words (pdf file):
America is at war with radical Islamists.
[. . .]
The game of bait-and-switch that today's opinion plays upon the Nation's Commander in Chief will make the war harder on us. It will almost certainly cause more Americans to be killed.
That's Antonin Scalia, on the dissenting side in the Supreme Court's 5-4 decision giving Gitmo detainees habeus corpus rights. Aliens detained abroad now have that constitutional right for the first time in American history. If anything will make me vote for John McCain, it's his pledge to nominate justices who wouldn't make up the Constitution's meaning as they go along.
On the other hand, McCain has been all mushy over detainee rights and probably likes this decision. Strange times.