Sgt. Benjamin N. Pennington, 26, was killed in Saudi Arabia.
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.
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Secretary of State Marco Rubio confirmed that a drone struck the parking lot near the U.S. Consulate in Dubai.
"All personnel are accounted for," he said.
While noting the U.S. drawdown of diplomatic staff has kept its personnel safe so far, Rubio called the threat "direct."
"Our embassies and our diplomatic facilities are under direct attack from a terroristic regime," he said.=
Secretary of State Marco Rubio said 1,500 Americans have requested State Department assistance to leave the Middle East.
Rubio said the State Department is trying to help through charter flights, military flights and commercial options. However, he said, "the impediment we're facing now, in many cases, we've had a couple instances in which we have planes in the air and on the way, and unfortunately, the airspace gets closed and they have to turn back around."
He said Americans should get in touch with the State Department through these phone numbers: +1-202-501-4444 (from abroad) and +1-888-407-4747 (from the U.S. and Canada).
The Senate will vote Wednesday on a Democratic-led Iran war powers resolution, according to a press release from Minority Leader Chuck Schumer and bill co-sponsors Sen. Tim Kaine and Sen. Adam Schiff. Timing for the vote isn't clear.
The resolution would direct the removal of U.S. Armed Forces from hostilities within or against Iran that have not been authorized by Congress.
President Donald Trump was pressed by reporters Tuesday about future plans for Iran.
The president said strikes on Iran were continuing, saying there was a strike on Tuesday "on the new leadership."
"I guess there was another hit today on the new leadership, and it looks like that was pretty substantial, also. So they're getting hit very hard, and we'll see what happens," Trump said.
The president also seemed to claim an early victory, saying the U.S. has Iran "beaten militarily."
"They're still lobbing some missiles. At some point, they won't even be able to do that because we're hitting all of their carriers. We're hitting all of their missile stock. You know, they built up all these missiles over the last few years. They had a lot of them. They've shot a lot of them. And we're knocking out a lot," Trump said.
