President Donald Trump is demanding that Iran provide written commitments regarding its nuclear program before agreeing to a preliminary deal, according to U.S. officials and sources familiar with the matter. During a meeting on Friday, Trump deemed verbal assurances from Iranian negotiators insufficient, seeking specific concessions on issues like the disposition of enriched uranium and limitations on enrichment activities. Secretary of State Marco Rubio testified that while financial incentives could be discussed later, Iran must first commit to concrete steps towards curbing its nuclear program. Talks have focused on a memorandum of understanding to extend a ceasefire, reopen the Strait of Hormuz, and establish a timeline for further nuclear negotiations, with a recent draft including a written pledge not to pursue nuclear weapons but lacking specifics on the broader program. Iran is currently reviewing the updated terms, and officials have not indicated its likelihood of acceptance, with the U.S. wary of monetary concessions at this stage.