The nuclear deal proposal the U.S. gave Iran on Saturday would allow limited low-level uranium enrichment on Iranian soil for a to-be-determined period of time, Axios has learned, contradicting public statements from top officials.

Iran is poised to reject a U.S. proposal to end a decades-long nuclear dispute, an Iranian diplomat said on Monday, slamming it as a "non-starter" that fails to address Tehran's interests and leaves Washington's stance on uranium enrichment unchanged.