• On the sidelines of the U.N. General Assembly, President Trump is asking allies to help toughen the Iran nuclear deal’s provisions. Federica Mogherini, the E.U.’s top diplomat, said that the deal should not be renegotiated, saying Tehran was in compliance.

President Hassan Rouhani of Iran took a swipe at President Trump, saying, “It will be a great pity if this agreement were to be destroyed by rogue newcomers to the world of politics.”

Our correspondent notes that Mr. Trump’s tough talk could hurt his chances in peacefully disarming North Korea. On today’s schedule: representatives of Russia, China and Germany.