On Thursday, John Brennan, the White House deputy national security advisor for homeland security and counterterrorism, will come before the Senate to interview for one of the most powerful jobs in the world: director of the Central Intelligence Agency (CIA). Brennan's nomination is by no means a fait accompli.

Brennan, who served in the top echelons of the CIA during the key early years of the Bush administration, still has many questions he hasn't answered regarding the agency's role in torture, indefinite detention and kidnapping during his time there. And he has at least as many questions to answer about his role running the killing program in the Obama White House.