The Senate will start working on a compressive aid package for Israel despite dysfunction in the House of Representatives, which remains without a speaker, Senate Majority Leader Chuck Schumer said Sunday.

"We’re not waiting for the House. We believe if the Senate acts in a strong bipartisan way, it may indeed improve the chances that the House, even with its current dysfunction, will act," Schumer told reporters in Tel Aviv.

Schumer led a bipartisan delegation of senators to Israel to meet with high-ranking government officials following the Oct. 7 deadly terror attacks by Hamas. On Sunday, Schumer and other members of the delegation were rushed into a bomb shelter in Tel Aviv to wait out a rocket attack, according to a social media post from the New York senator.

-ABC News' Davone Morales

ABC foreign correspondent James Longman spoke with former Israeli Prime Minister Naftali Bennett, who said Israel has taken "a big hit, there's no way around that."

"But we're at war right now," he said. "We're between the first phase where we took the huge hit and the second phase where we're hitting back."

"Over the next few days, we're going to launch a massive attack on Hamas. It's going to be tough, it's going to be long," Bennett continued, later adding: "Israel is ready to fight."

Israeli Prime Minister Benjamin Netanyahu said Sunday during an during an emergency cabinet meeting, "Hamas thought we would be demolished. It is we who will demolish Hamas," Reuters reported.

Watch Bennett's interview here:

As time dwindles ahead of an anticipated Israeli ground invasion of Gaza, the U.S. is calling on fleeing citizens to head toward the southern border crossing to Egypt.

"We have been working around the clock. We have an entire dedicated team that is working on nothing but this: helping American citizens who are in Gaza be able to get safe passage through the border crossing to Egypt," Jake Sullivan told ABC "This Week" co-anchor Martha Raddatz on Sunday.

The U.S. Embassy in Jerusalem on Sunday morning urged U.S. citizens trapped in the Gaza Strip to move to southern Gaza along the main highway, the Salah al-Din Street.

"We are currently striking Hamas in its entirety," Israel Defense Forces Lt. Col. Peter Lerner told ABC News "This Week" co-anchor Martha Raddatz on Sunday.

"We did not ask for this war, but we will win it," he said.

Lerner also had a message for Hezbollah.

"I would highly recommend that Hezbollah watch very closely what is happening to Hamas and the organization in Gaza as we speak," he said. "They should be very cautious of crossing that threshold, because we are determined to defend the state of Israel."

Israeli forces have been engaging in skirmishes with the Lebanese militant group along Israel's northern border with Lebanon in the days since Hamas' surprise attack on Israel from Gaza on Oct. 7.

Watch the interview here:

-ABC News' Tal Axelrod

Human Rights Watch has accused Israel of using white phosphorus munitions in military operations in Gaza on Wednesday, saying it violated international humanitarian law by putting civilians at unnecessary risk.

In a report released Thursday, Human Rights Watch said it based its determination on a video it said it has verified, as well as two eyewitness accounts.

The Israel Defense Forces said in a statement to ABC News that claims they used white phosphorus in Gaza are "unequivocally false."

ABC News geolocated a video showing a jellyfish-shaped plume of white smoke over the port of Gaza. The video was posted on Wednesday by the official Palestinian news agency WAFA and matches images posted on social media and by other news outlets on the day.

Two experts -- Amael Kotlarski, the weapons team manager for the defense intelligence firm Janes, and Amnesty International weapons investigator Brian Castner -- told ABC News that images suggested munitions deployed over the port of Gaza on Wednesday appeared to contain white phosphorus.

"We have verified that Israeli artillery forces striking Gaza are equipped with M825 and M825A1155mm white phosphorus projectiles," Castner told ABC News, pointing to photographs by an Anadolu Agency photographer taken on Monday and showing Israeli troops handling shells labeled "M825A1."

Kotlarski said visual evidence alone was not sufficient to confirm that these specific shells were used in the Gaza port strikes.

There are "perfectly legal" military uses for white phosphorus munitions, Kotlarski said, including to create a smoke screen to conceal movements, to mark targets for artillery or air strikes, or to illuminate a battlefield. However, its use in urban areas is "problematic due to the higher risk of collateral damage," Kotlarski said, including the munitions' potential to cause severe burns.

White House Principal Deputy Press Secretary Olivia Dalton said Friday the U.S. had not independently verified allegations Israel used white phosphorous "so that is not something I would want to speculate about or weigh in on at this time."

-ABC News' Christopher Looft, Ben Gittleson and Jordana Miller