The president had said earlier that he didn't want to see prosecutions of the CIA agents and interrogators who took part in waterboarding and other harsh interrogation tactics, so long as they acted within parameters spelled out by government superiors who held that such practices were legal at the time.

But the administration's stance on Bush administration lawyers who actually wrote the memos approving these tactics has been less clear and Obama declined to make it so. "There are a host of very complicated issues involved," Obama said.