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.
Defense Secretary Pete Hegseth and Gen. Dan Caine, chairman of the Joint Chiefs of Staff, are scheduled to hold a press conference at 8 a.m. ET on Tuesday, according to the Department of Defense.
Nearly 40 people were killed in a strike on two buildings in eastern Tehran, according to local authorities, as the semi-official Tasnim News Agency reported Monday evening.
Two buildings, each containing 20 residential flats, were destroyed by missiles, the semi-official Mehr News Agency reported, quoting the head of the Tehran Fire Department.
“Tens of martyrs have been taken out. Many bodies are still under the rubble, and one body recovered from the building cannot be identified as a woman or a man because it is totally disintegrated,” the head of the Tehran Fire Department said, according to Mehr.
-ABC News' Somayeh Malekian
The Israel Defense Forces on Tuesday morning issued another "urgent warning" to residents south of the Litani River in Lebanon -- virtually all of the country's south -- again ordering them to evacuate "immediately" and head north of the river.
It's the fourth such notice the IDF has issued amid the ongoing war with Iran. The third forced evacuation for southern Lebanon came Sunday.
-ABC News' Ghazi Balkiz
A second person has now died from their wounds succumbed in Monday's Iranian cluster bomb strike in central Israel, a spokesperson for Sheba Medical Center -- Israel's largest hospital -- told ABC News on Tuesday morning.
That brings the Israeli death toll from Iranian attacks since the ongoing war began on Feb. 28 to at least 12, according to local hospitals and the national emergency service. This number does not include a person who died from cardiac arrest during one attack.
-ABC News' Jordana Miller
