Donald Trump vetoed an Israeli plan to kill Iran’s supreme leader, according to American officials. Details of the plan to kill Ayatollah Ali Khamenei emerged on Sunday night after Mr Trump warned Iran not to target American interests and car bombs rocked Tehran, the Iranian capital. The White House has made clear it is intent on limiting Israel’s actions to degrading Iran’s nuclear weapons programme and does not want a wider regional war. World leaders were due to meet in Calgary, Canada, on Monday at a G7 summit where conflict in the Middle East is expected to dominate the agenda....