In a move that has shocked career national security officials, President Trump stripped former CIA Director John Brennan of his security clearance this week, and announced he was considering doing so for a host of others. The move so enraged retired Navy Admiral William McRaven\u2014the man who oversaw the killing of Osama Bin Laden\u2014that he wrote an op-ed telling Trump to revoke his clearance too, in solidarity with Brennan.