A major architect of U.S. drone policy, John Brennan, will appear today before the Senate as President Obama's nominee to be CIA director. Last night the White House ordered the release of classified drone documents to lawmakers. The Obama administration has increasingly relied on predator drones to fight terrorism. A number of high-level terrorists have been killed by drone strikes. Supporters of U.S. drone policy say it's effective, less costly and will remain a major tool in warfare. But human rights activists and other critics say civilian casualties are still too high, the program lacks transparency and the U.S. might be setting precedents it will come to regret. Guest host Tom Gjelten talks with a panel of experts about drones and counterterrorism.