The United States has rejected a proposal from Iran over concerns that it fails to adequately address Tehran’s nuclear programme, according to a senior U.S. official.

The official said Donald Trump is dissatisfied with the offer, emphasizing that Washington’s “red line” remains unchanged any agreement must directly tackle Iran’s enriched uranium stockpiles and ongoing enrichment activities from the outset.

Speaking at a briefing, Karoline Leavitt confirmed that President Trump convened a meeting with his national security team to review the proposal and assess next steps. She did not provide further details on the content of the discussions but reiterated the administration’s firm stance on nuclear safeguards.

The development underscores ongoing tensions between Washington and Tehran, with negotiations appearing to face renewed obstacles. U.S. officials have consistently maintained that preventing Iran from advancing its nuclear capabilities remains a top priority.

Analysts warn that the breakdown in negotiations could heighten geopolitical uncertainty, particularly in the Middle East, as both sides remain far apart on key conditions for a potential deal. Further diplomatic engagements are expected, though no timeline has been confirmed.