Sen. Carl Levin (D-Mich.) pressed John Brennan on whether waterboarding is torture. President Obama's nominee to lead the CIA would not give a yes or no answer, but he said that waterboarding would never be reintroduced on his watch. He also said he was unsure whether the use of harsh interrogation techniques had led to useful intelligence.

Saying he wasn't a lawyer, Brennan noted that "the attorney general has referred to waterboarding as torture." But, he said, "the term has a lot of legal and political implications."