More than two months into a conflict that has failed to deliver a decisive military or diplomatic win, United States President Donald Trump faces the risk that a standoff with Iran will drag on indefinitely and leave an even bigger problem for the US and the world than before he launched the war. With both sides outwardly confident they hold the upper hand and their positions far apart, there is no obvious off-ramp in sight, even as Iran submitted a fresh proposal to restart negotiations. Trump quickly rejected it on Friday. For the US president and his Republican Party, the implications of a continued impasse are grim. An unresolved conflict would likely mean the global economic fallout , including high US gasoline prices, will persist, putting further pressure on Trump, whose poll numbers are falling, and darkening Republican candidates’ prospects ahead of November’s midterm congressional elections. Unmet goals Those costs highlight a deeper problem: the war has failed to achieve many of Trump’s stated goals. While there is little doubt that waves of US and Israeli strikes heavily degraded Iran’s military capabilities, many of Trump’s often-shifting war objectives — from regime change to shutting Iran’s path to a nuclear weapon — remain unfulfilled. Fears for a more protracted deadlock have grown since Trump called off a trip by his negotiators to Islamabad last weekend and then dismissed an Iranian offer to halt the war, suspended since April 8 under a ceasefire agreement. Tehran proposed setting aside discussion of its nuclear programme until the conflict is formally ended and a deal is reached on reopening the Strait of Hormuz. That was a non-starter for Trump, who has demanded the nuclear issue be dealt with at the outset. There was a glimmer of hope on Friday when state news agency IRNA reported Tehran had sent a revised proposal through Pakistani mediators, causing a drop in global oil prices that had risen sharply since Iran effectively closed the strait. Trump told reporters he was “not satisfied” with the offer, though he said there were ongoing contacts by phone. A failure to wrest the vital oil-shipping waterway from Iranian control at the conclusion of the conflict would be a major blow to Trump’s legacy. He’d be remembered as the US president who made the world less safe, said Laura Blumenfeld, a Middle East expert at Johns Hopkins University in Washington. White House spokeswoman Olivia Wales said Iran’s “desperation” is increasing due to military and economic pressure, and Trump “holds all the cards and has all the time he needs to make the best deal”. Resumption of hostilities? With his next steps uncertain and no clear endgame, Trump has, in private meetings, raised the prospect of a prolonged naval blockade of Iran, possibly for months more, aimed at further squeezing off its oil exports and forcing it to reach a denuclearisation agreement, a White House official said on condition of anonymity. At the same time, he has left the door open to resuming military action.