Trump told reporters that he is talking to countries about policing the Strait.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israel strikes attack targeting military and government sites, officials said.
Iranian state television confirmed that Ayatollah Ali Khamenei was among those killed in Tehran on the first day of strikes. His son Mojtaba Khamenei was chosen on Sunday to succeed him.
Iran is responding to the operation with missile and drone attacks targeting Israel, regional U.S. bases and multiple Gulf nations. Israel is also intensifying its long-running strike campaign against the Iran-backed Hezbollah militia in Lebanon.
(Read previous Iran live updates here.)
Watch special coverage on Nightline, "War with Iran," each night on ABC and streaming on Disney+ and Hulu.
Rescue and recovery operations were underway on Sunday at "several incident sites" in central Israel after reports of an Iranian aerial attack, the Israel Defense Forces said on social media.
The Iranian military launched another wave of missile and drone strikes overnight, officials said statement on Sunday morning.
At least 10 hypersonic missiles were launched, along with an unspecified number of drones, the Islamic Revolutionary Guard Corps said in a statement.
The IRGC said the targets included U.S. forces at Al-Dhafra Air Base, in the United Arab Emirates, for playing "an intelligence-support role in the invasion of the Islamic Republic of Iran," along with being a regional command location.
-ABC News’ Somayeh Malekian
The Pentagon identified the six service members killed when a U.S. KC-135 refueling aircraft crashed in western Iraq on Thursday.
Three of the Air Force airmen were assigned to the 6th Air Refueling Wing, MacDill Air Force Base in Florida.
The other three airmen were assigned to the 121st Air Refueling Wing at Rickenbacker Air National Guard Base in Columbus, Ohio.
The crash, which involved another KC-135 tanker, is still under investigation.
The aircraft was lost while flying over friendly airspace in western Iraq March 12 during Operation Epic Fury, according to U.S. Central Command.
Two drones targeted Ahmed Al-Jaber Air Base in Kuwait on Saturday "resulting in some material damage in the vicinity of the base, and three members of the armed forces sustained minor injuries," the Kuwaiti army said.
Those injured are currently in stable condition, according to the army.
