Maj. Gen. Pat Ryder, the Pentagon press secretary, said Monday that Iran did not give the U.S. an advanced notice of its attack on Israel.

"I think what you're asking was did Iran give us a heads up? No, they did not," Ryder said, without indicating whether the U.S. learned of Iran's plans through allies.

Ryder said U.S. forces in the Middle East intercepted dozens of missiles and unmanned aerial vehicles when Iran and its proxies launched attacks in retaliation for Israel's strike earlier this month on the Iranian Consulate in Damascus, Syria, that killed an Iranian military leader.

Ryder repeated assessments that 99% of incoming Iranian fire was intercepted by Israel and its partners, but he wouldn't confirm reports that half of the launches failed to get off the ground.

Secretary of Defense Lloyd Austin, Ryder said, has spoken with Israeli Defense Minister Yoav Gallant three times since the attack.

"During their most recent call yesterday, the two leaders reviewed the successful combined operation by the United States, Israel and their partners to defend Israel from these unprecedented attacks by Iran and its proxies and emphasize that while the United States does not seek escalation, we will continue to take all necessary action to defend Israel and U.S. personnel," Ryder said.

Asked whether the response to Iran's attack depleted the air defense resources of Israel and its partners, Ryder declined to answer.

"As we demonstrated this weekend, we have the capability and the capacity to defend Israel and to defend our forces in the region," he said.

-ABC News' Chris Boccia and Matt Seyler

As Israel's Chief of the General Staff Herzi Halevi met with troops at the Nevatim Airbase, where Iranian missiles struck over the weekend, he said Israel is weighing possible response actions.

"As we look forward, we weigh our steps, and this launch of so many missiles, cruise missiles, UAVs to the territory of the State of Israel will be met with a response," Halevi said.

-ABC News’ Jordana Miller

As Israel on Monday weighed its response to Iran’s weekend attack, the U.S. is privately telling officials there: If Israel strikes back militarily, it will do so alone.

It's an unusual message for a close ally that's spent decades receiving more U.S. military aid than any other country in the world and whose relationship with America is often described as "ironclad."

But after months of Israel acting on its own in Gaza -- and facing tough criticism from the U.S. and other allies that its military operations have gone too far – the Biden administration made clear the U.S. wouldn't participate in offensive military operations against Iran, fearing a broader war in the Middle East.

"We believe Israel has freedom of action to protect itself and defend itself," a senior administration official told reporters shortly after Iran's attack ended. "That's a long-standing policy, and that remains."

When asked by a reporter if the U.S. would help Israel counter with offensive military operations, the official said no.

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-ABC News’ Anne Flaherty

President Joe Biden on Monday touted the "unprecedented military effort to defend Israel" against Iran, declaring "together with our partners we defeated that attack."

In his first on-camera remarks since this weekend's Iranian strike, the president stressed that "the United States is committed to Israel's security."

"We're committed to a cease-fire that will bring the hostages home and preventing the conflict from spreading beyond what it already has" the president told reporters in the Oval Office ahead of his meeting with the Iraqi prime minister. "We are also committed to the security of our personnel and our partners in the region, including Iraq."

During a meeting at the White House on Tuesday with the families of Americans being held hostage by Hamas, Vice President Kamala Harris said there is "no higher priority than reuniting the hostages with their loved ones," according to a White House readout.

Harris also reaffirmed the United States' commitment to bringing home the remains of those hostages who have been confirmed dead, according to the readout.

Rachel Goldberg-Polin, whose 23-year-old son Hersh is being held hostage by Hamas, described the meeting with Harris as "very productive."

“There is a possibility of holding two truths,” Goldberg-Polin told reporters outside the White House. “You can believe, as we do, that it is horrible that innocent civilians in Gaza are suffering, and at the same time you can also know that it is horrible and against international law for hostages to be held against their will."

Goldberg-Polin said her son got his arm blown off during Hamas' attack at the Nova Music festival on Oct. 7. Her husband, Jonathan Polin, said that they "have no choice but to stay hopeful."

Jonathan Dekel-Chen, the father of American hostage Sagui Dekel-Chen, called on Hamas to reach a deal to release the hostages.

"We are waiting now and the world waits for Hamas to get to yes," Dekel-Chen told reporters. "It is in their court."

-ABC News' Juhi Doshi