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.
“Modern tyranny is terror management. When the terrorist attack comes, remember that authoritarians exploit such events in order to consolidate power. The sudden disaster that requires the end of checks and balances, the dissolution of opposition parties, the suspension of freedom of expression, the right to a fair trial, and so on, is the oldest trick in the Hitlerian book. Do not fall for it.”
Timothy Snyder, On Tyranny