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.

7:20

Biden has ‘no higher priority’ than getting American hostages back: Sullivan

ABC News’ Martha Raddatz interviews national security adviser Jake Sullivan on “This Week.”

"Our goal is to ensure that every American who is in Gaza has safe passage out, and we will not rest until that happens," Sullivan said.

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"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:

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‘We did not ask for this war, but we will win it’: IDF spokesman

ABC News’ Martha Raddatz interviews IDF spokesman Peter Lerner on “This Week.”

-ABC News' Tal Axelrod

The situation in Gaza is "about as bad as it can get," Sari Bashi, program director of Human Rights Watch, told ABC News Live Sunday.

"People are being forced to drink brackish, untreated water because the price of bottled water has gone up beyond what most people can afford," Bashi said. "Food is short, there is no electricity. Even emergency generators that hospitals have are running low on fuel, and supplies are dwindling."

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5:43

Dire situation in Gaza as supplies cut off

Sari Bashi, program director of Human Rights Watch, details how the Israeli military cut food, fuel and electricity to the Gaza Strip.

While on a bipartisan congressional delegation trip to Israel, Senate Majority Leader Chuck 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 Schumer.

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Schumer gives congressional delegation update

Sen. Chuck Schumer said that the congressional delegation on a trip to Israel was rushed to a bomb shelter in Tel Aviv amid rocket fire.

"It shows you what Israelis have to go through," Schumer said in his post on X, which included a photo showing him and Republican Sen. Mitt Romney, a Romney staff and several others huddled in the small bomb shelter.