President Donald Trump and his administration increasingly believe that they can’t promise to reopen the Strait of Hormuz as a prerequisite to declaring “mission accomplished” in the war with Iran, sources familiar with the discussions tell CNN.

The U.N. Security Council is scheduled to vote Friday on a proposal to secure the Strait of Hormuz after it was significantly watered down in the face of opposition from China and Russia about allowing force to reopen the critical waterway that Iran has largely cut off to global shipping.