UN Ambassador Mike Waltz said the ceasefire with Iran has "broken down", arguing Tehran is not honoring the preliminary agreement reached in June
The United States and Iran appear close to a deal to end their war and reopen the Strait of Hormuz.
Trump has said multiple times in recent weeks that the warring parties have been on the cusp of a deal without anything coming to fruition.
The U.S. military says it's begun another round of strikes against Iran.
Iran fired on Israel following Israeli strikes in the Lebanese capital Beirut.
Israel says Iran has launched missiles at it in the first such bombardment since a fragile ceasefire took effect in early April, complicating mediation efforts for a deal to end the war.