WASHINGTON (AP) — The survival of President Barack Obama's health care overhaul rests with a Supreme Court seemingly split over ideology and, more particularly, in the hands of two Republican-appointed justices.

Chief Justice John Roberts and Justice Anthony Kennedy posed tough questions to administration lawyers defending the health care law during three days of arguments that suggested they have strong reservations about the individual insurance requirement at the heart of the overhaul and, indeed, whether the rest of the massive law can survive if that linchpin fails.

But Roberts and Kennedy also asked enough pointed questions of the law's challengers to give its supporters some hope. In any event, justices' questions at arguments do not always foretell their positions.