With Iran nuclear talks nearing a critical deadline Tuesday, diplomats raised doubts that a meaningful deal could be reached in time even as the White House faces political hurdles in Washington to extend negotiations. Gaps between the two sides include how quickly Western nations would lift punitive sanctions against Iran, and what types of nuclear research Tehran would be allowed to continue, diplomats said. Negotiators also are grappling over access by international inspectors to Iran’s military sites, where evidence has suggested the possibility of past experiments on weapons technology. The differences between Iran and international powers are so wide that any agreement reached by Tuesday would likely be vague and wouldn’t necessarily be written down in a formal text, U.K. Foreign Secretary Philip Hammond warned Friday. Speaking […]