Asserting zero enrichment policy, Trump Declares 'No Uranium Enrichment' as Iran Nuclear Talks Falter. U.S. President Donald Trump stated on Monday that his administration “will not allow any enrichment of uranium” under a proposed new nuclear deal with Iran. His firm declaration, made via social media, came shortly after media reports suggested that the U.S. negotiating team, led by Special Envoy Steve Witkoff, had offered Tehran a more flexible interim deal.