President Donald Trump arrives at Joint Base Andrews in Maryland, Aug. 16, 2026. On Monday, the day his already crumbling deal with Iran officially ended, President Trump lashed out at American ally Oman, repeating a threat to bomb the country if it interferes with U.S. negotiations with Iran. (Al Drago/The New York Times) By LUKE BROADWATER As a crumbling truce with Iran officially collapsed Monday, President Donald Trump signaled his frustration at his inability to resolve a war that he…