The assessment widens the divide with President Trump, who has claimed that Tehran has given up its nuclear ambitions after a U.S. attack.

Iran likely can resume uranium enrichment to make a nuclear bomb in a few months, despite damage to nuclear facilities by United States and Israel airstrikes, the United Nations' nuclear watchdog chief said.

IAEA Director General Rafael Grossi looks on during a doorstep with Austrian Chancellor Christian Stocker, Austrian Vice-Chancellor Andreas Babler and Austrian Foreign Minister Beate Meinl-Reisinger at the Austrian Chancellery in Vienna,