By Sarah N. Lynch WASHINGTON (Reuters) – A federal judge on Monday postponed a June trial date for two men accused of assaulting police during last year’s attack on the U.S. Capitol after an attorney for one of the defendants expressed optimism a plea deal could be reached. Julian Khater and George Pierre Tanios had been slated to go to trial on June 6 on multiple criminal charges including assaulting at least three U.S. Capitol and Washington police officers with a chemical agent. U.S. District Judge Thomas Hogan agreed to reschedule the trial to Oct. 5 to give the parties more time to negoti…