On May 20, 2026, U.S. President Donald Trump stated that the United States was prepared to conduct additional strikes on Tehran unless Iran accepted a peace deal, while also indicating that Washington could wait several days for acceptable responses. Iran confirmed it was examining a new U.S. proposal and repeated demands for the release of frozen assets and an end to port blockades. U.S. Marines boarded an Iranian-flagged oil tanker in the Gulf of Oman the same day.