Why it matters: 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. The secret proposal shows far more flexibility on both points.

The intrigue: Iran has consistently said it won't sign any deal that bans enrichment for civilian purposes — a red line that is irreconcilable with the U.S. public posture.