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.)
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A fire that broke out at Abu Dhabi International Airport after debris fell due to an air defense interception is now under control, according to UAE officials.
The UAE said earlier that it was intercepting missile attacks and incoming drones originating from Iran on Wednesday.
Iran and its proxy groups "may be planning to target U.S.-owned oil and energy infrastructure in Iraq," the U.S. State Department warned Wednesday.
Other critical energy sites in the country have already been hit during the course of the conflict. Iraq's crude oil production has already dramatically dropped in recent days, according the Iraqi Oil Ministry.
"Iran-aligned terrorist militias have also targeted hotels frequented by Americans throughout Iraq, including the Iraqi Kurdistan Region," the State Department said.
-ABC News' Shannon K. Kingston
Hezbollah launched missiles toward several parts of Israel on Wednesday, according to the Israel Defense Forces.
"The IDF will not tolerate any harm to Israeli civilians and will forcibly respond against any threat posed to the State of Israel," the IDF said in a statement.
At least 634 people have been killed and 1,586 wounded in Lebanon as Israeli strikes continue, according to the Lebanese Ministry of Health.
At least 700,000 people are now internally displaced within Lebanon as Israel says it is targeting Hezbollah infrastructure and leadership, according to the United Nations.
