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.
“A nation can survive its fools, and even the ambitious. But it cannot survive treason from within. For the traitor appears not a traitor; he wears their face and their arguments, he appeals to the baseness that lies deep in the hearts of all men. He rots the soul of a nation, he works secretly and unknown in the night to undermine the pillars of the city, he infects the body politic so that it can no longer resist. A murderer is less to fear. The traitor is the plague.” Marcus Tullius Cicero