A senior Iranian official told CNN the new nuclear deal proposal presented to Tehran in recent days is “incoherent and disjointed,” as sources familiar with the progress of the talks said the momentum behind negotiations to secure a new deal appears to be collapsing.

Iran has warned the U.S. that it will not give up its right to its enrich uranium, casting doubt on prospects for a deal as Tehran considers a U.S. proposal for curbing its nuclear program. Newsweek has reached out to the U.

White House envoy Steve Witkoff and Secretary of State Marco Rubio have said publicly that the U.S. will not allow Iran to enrich uranium and will demand the full dismantlement of Iran's nuclear facilities.