Iran live updates: White House calls on other nations to secure Strait of Hormuz

At an event honoring wrongful detainees and hostages, Secretary of State Marco Rubio said Monday that Iran's retaliation laid bare the threat it poses to countries near and far.

"They are trying to hold the world hostage. They are attacking their neighbors. They are attacking neighboring countries, their energy infrastructure, their civilian population, they're attacking embassies," he said. "This is a terrorist government. This is a terroristic regime."

He also offered a moment of silence for the seven killed Americans.

"We all are all in awe of their service, of their bravery, of their courage, and our hearts and our support extend out to their families in this very difficult moment, and the families of these incredible heroes," he said.

-ABC News' Shannon Kingston

The seventh service member to die from Iranian attacks has been identified by the Defense Department as Sgt. Benjamin N. Pennington, 26, of Glendale, Kentucky.

Pennington was wounded on March 1 when his base in Saudi Arabia was attacked. He died from his injuries on Sunday, the Defense Department said.

Pennington was at a strategic radar site that's part of the early warning systems for missile defense, according to a source familiar with the situation.

Sgt. Benjamin N. Pennington, 26, was killed in Saudi Arabia.

President Donald Trump told Fox News's Brian Kilmeade on Sunday that ships holding at the Strait of Hormuz need to "show some guts" and push through the channel.

"There's nothing to be afraid of, they have no Navy, we sunk all their ships... and all but 20% of their launchers," Trump said.

The Strait of Hormuz is the critical maritime passageway between Iran, Oman and the UAE through which about one-fifth of the world's oil passes.

Trump also told Kilmeade he was "not happy" with the selection of Ali Khamenei's son Mojtaba Khamenei as the new supreme leader of Iran.

-ABC News' Nicholas Kerr

The Israeli military said it had begun on Monday a "targeted and limited" raid in southern Lebanon, where it says it's targeting Hezbollah infrastructure.

"Prior to the entry of ground forces, numerous terror targets were struck from the air and ground," the Isreal Defense Forces said on social media.

"This operation aims to strengthen forward defensive positions and provide an additional layer of protection for residents of northern Israel," the military added.