Iran's supreme leader bans negotiations with the United States

Iran's Supreme Leader Ayatollah Ali Khamenei on Wednesday banned any further negotiations between Iran and the United States, putting the brakes on moderates hoping to end Iran's isolation after reaching a nuclear deal with world powers in July.

Khamenei, the highest authority in the Islamic Republic, already said last month there would be no more talks with the United States after the nuclear deal, but has not previously declared an outright ban.