Alan Dershowitz and Michael Hayden versus Alexis Ohanian and Glenn Greenwald, with a video appearance by Edward Snowden.
The actual debate starts around minute 27 on the video. You may use your cursor to click ahead to it.
Saint Michael the Archangel, defend us in battle; be our protection against the wickedness and snares of the devil. May God rebuke him, we humbly pray: and you, Prince of the heavenly host, by the power of God, thrust into Hell Satan and all of the other evil spirits who prowl about the world seeking the ruin of souls.