Interesting debate on the legality of the EU-Turkey deal between Prof. Hathaway and Prof. Hailbronner.
First is the interview of Prof. Hathaway: http://verfassungsblog.de/three-legal-requirements-for-the-eu-turkey-deal-an-interview-with-james-hathaway/.
Then, a response from Prof. Hailbronner: http://verfassungsblog.de/legal-requirements-for-the-eu-turkey-refugee-agreement-a-reply-to-j-hathaway/ to which Prof. Hathaway replied back: http://verfassungsblog.de/taking-refugee-rights-seriously-a-reply-to-professor-hailbronner/.