A White House national security official was fired after sending insulting messages on Twitter under a fake name, a senior administration official said. The story about National Security Council Director of Nonproliferation Jofi Joseph was first reported by the Daily Beast. Joseph was fired for messages sent on the account @natsecwonk, the administration official confirmed. The Daily Beast reported the account had been used to send messages to the foreign policy community since 2011. The website said some of the tweets contained messages that insulted top White House officials. That account had been deleted Tuesday evening.