Justice Stephen Breyer will not express an opinion on Donald Trump as a presidential candidate, in keeping with two centuries of Supreme Court tradition. But he did express an opinion on a related point: American courts are unlikely to allow Muslims to be held in detention camps.
Nobody, including Trump, has suggested we send Muslims to a detention camp. This is just the left leaning media attempting to start controversy where none exist. I'm fairly certain Justice Breyer's didn't volunteer that information without being asked.