Five things we learned from John Brennan's confirmation hearing

Washington (CNN) - John Brennan came well-prepared Thursday and held his own during questioning at his Senate confirmation hearing to become the 21st director of the Central Intelligence Agency. It was in stark contrast to what was considered by many as an ill-prepared, lethargic performance by defense secretary nominee Chuck Hagel at his confirmation hearing last week.

Democrats on the Senate Intelligence Committee mostly grilled Brennan about his knowledge of the CIA's controversial interrogation and detention program and the lethal targeting of suspected terrorists. Republicans tended to focus on leaks of secret information about counterterrorism activities.