We’ve been having a lively discussion here on the site about the propriety of the open letter to Iran sent by Tom Cotton and 46 other Republican senators. In the newest installment of The Libertarian podcast from the Hoover Institution, I ask Professor Epstein to weigh in: was the Cotton letter a breach of protocol…or law? Is President Obama right to pursue an executive agreement rather than a treaty with Iran? And what does it all mean for American national security? Find out by listening below or by subscribing to The Libertarian through iTunes or your favorite podcast service.