"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:

6:45

‘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."

Watch more here:

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.

2:33

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.

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.

U.S. citizens who can do so safely were advised by the embassy to flee to the south of the Gaza Valley toward the city of Khan Younis as U.S. officials work on potential options for getting them out of Gaza.

8:01

Is Israel’s ground invasion of Gaza imminent?

ABC News Chief National Correspondent Matt Gutman joins ABC News’ Phil Lipof to break down the potential timeline for Israel’s pending ground offensive in Gaza.

As of Sunday morning, the only exit to the south of Gaza, the Rafah crossing at the Egyptian border, remained closed to all seeking to flee Gaza, officials said.

But Tala Herzallah, a Palestinian woman trapped in Gaza, told ABC News Sunday that Israel Defense Forces are continuing to bomb both Khan Younis and Rafah, saying homes were hit in the areas Saturday night.

"They’re telling us to move there, and then they are bombing the houses there without warning people," Herzallah said.

The military conflict between Israel and Hamas is ongoing, making identifying departure options for U.S. citizens complex, the U.S. Embassy said.  

Embassy officials encouraged U.S. citizens to complete a crisis intake form to provide contact information "should we need to reach out to you on short notice."

-ABC News' Clark Bentson