Torture was banned during the Geneva Conventions, and waterboarding is widely considered torture by everyone from the U.S. Justice Department to Amnesty International, legal experts and the United Nations. The United States, under President George W. Bush and thanks in part to the efforts of Deputy Assistant U.S. Attorney General John Yoo, waterboarded people. Yoo still defends our use of the practice, but says that Trump is totally misunderstanding it. "I'm afraid Mr. Trump thinks of waterboarding, or worse, as a kind of punishment, like a sentence -- as you said, revenge or reprisals," he told Fox News' Brian Kilmeade on Tuesday. "That's not what its purpose is. The purpose of it is not to take revenge for past acts. It's to figure out what to do now to get intelligence to stop future attacks."