Agencies ABU DHABI

U.S. President Donald Trump on Friday said Iran has his administration's proposal and knows it needs to move quickly, a day after saying Washington and Tehran were close to a nuclear deal.

"They have a proposal. More importantly, they know they have to move quickly or something bad—something bad's going to happen," Trump told reporters aboard Air Force One after departing the United Arab Emirates, according to an audio recording of the remarks.

Trump’s remarks represent the first time he’s acknowledged an American proposal is with Tehran after multiple rounds of negotiations between U.S. Mideast envoy Steve Witkoff and Iranian Foreign Minister Abbas Araghchi.

His remarks came before diplomats from Iran and the three European parties, Britain, France and Germany remaining in a moribund 2015 nuclear deal met in Istanbul on Friday, Iranian and British officials said, their first round of talks since the U.S. began nuclear talks with Tehran in April.

An Iranian source close to the negotiating team said Tehran has yet to receive the U.S. proposal, "but Oman has got it and will hand it over to Tehran soon". The European powers are not part of current negotiations between Iran and the United States.

Negotiations have gotten into the “expert” level — meaning the two sides are trying to see if they can reach any agreement on the details of any possible deal. But one major sticking point remains Iran’s enrichment of uranium, which Tehran insists it must be allowed to do and the Trump administration increasingly insists the Islamic Republic must give up.

Trump made the comment aboard Air Force One as he ended his trip to the United Arab Emirates, the last stop on his three-nation tour of the Middle East that also included Saudi Arabia and Qatar.