U.S. officials’ meetings with Israeli Prime Minister Netanyahu in Washington, D.C., last week were "very constructive and certainly nothing that discouraged us in terms of trying to close the remaining gaps" while trying to secure the hostage deal, National Security Council spokesman John Kirby told reporters Monday.

"We still believe those gaps can be narrowed ... and we can move forward. But obviously, as I said earlier, it's going to take compromise, it's going to take leadership," he said.

"There's no indication that we see, at this point in time, the weekend strike by Hezbollah into the Golan [Heights] area is going to negatively affect those discussions," Kirby added.

Kirby also pushed back on the suggestion that Vice President Kamala Harris had a different message for Netanyahu from President Joe Biden, saying there was "no daylight" between their messages, and that reporting suggesting otherwise was "unfortunate and inaccurate."

"There was no daylight between anything, the president, the vice president told the prime minister. Same points, same emphasis -- the commitment and reaffirmation to help Israel continue to defend itself against these threats. Same reaffirmation by both the president and the vice president, that we want to see the cease-fire deal get enacted because of what it can do to improve the humanitarian situation. And of course, getting those hostages home with their families," Kirby said.

Pressed on why Harris had her own meeting if their message was the same, Kirby defended Harris.

"The vice president couldn't be in town for the meeting in the Oval [Office], and as she has been a full partner in all our foreign policy, but certainly in particular, the policy that this administration has pursued with respect to the Middle East, she felt it was important to also sit down with Prime Minister Netanyahu,” Kirby said.

-ABC News’ Molly Nagle

The United States "absolutely condemn this weekend's horrific attack" that killed children playing soccer in Majdal Shams in the Israeli-controlled Golan Heights, National Security Council spokesman John Kirby told reporters Monday.

At least 12 people were killed, according to the Israel Defense Forces. Hezbollah has denied involvement in the rocket attack but Secretary of State Antony Blinken said Sunday that "every indication" points to Hezbollah as responsible for the strike.

Kirby also assigned blame to Hezbollah in Lebanon, saying "it was their rocket launched from an area that they control."

"The United States will continue to support efforts to reach a diplomatic solution along that blue line that will, No. 1, end these terrible attacks once and for all, and No. 2, allow Israeli and Lebanese citizens on both sides of the border to safely return to their homes," Kirby said.

Kirby stressed that U.S. support for Israeli security remains "ironclad" against all Iran-backed threats, adding, "We believe that there is still time and space for a diplomatic solution."

Asked if the administration was urging Israel to show restraint in any response, Kirby said that Hezbollah made the first strike on Israel back in October and that "Israel has every right to respond," but he said he was confident that a broader conflict could be avoided.

"Nobody wants a broader war and I'm confident that we'll be able to avoid such an outcome. I'll let the Israelis really speak to whatever their response is going to be," Kirby said.

-ABC News’ Molly Nagle

Israeli Prime Minister Benjamin Netanyahu and Defense Minister Yoav Gallant were granted the authority Sunday to decide the manner and timing of a response to the alleged attack by Hezbollah on the town of Majdal Shams in the Golan Heights, according to the prime minister's office.

During a meeting in Tel Aviv, members of Israel's political-security cabinet gave Netanyahu and Gallant the authority to devise a plan to retaliate for the strike that killed 12 people, including children playing soccer, according to the statement from the prime minister's office.

"The members of the cabinet authorized the Prime Minister and the Minister of Defense to decide on the manner of response against the terrorist organization Hezbollah, and when," according to the statement.

Hezbollah has denied involvement in the rocket attack. The Israel Defense Forces and the White House both blamed Hezbollah for the attack.

-ABC News' Jordana Miller

The White House on Sunday blamed Hezbollah for the rocket strike Saturday on Golan Heights that it said killed children playing soccer.

At least 12 people were killed in the weekend attack in Majdal Shams, a town in the Golan Heights, according to the Israel Defense Forces.

"We have been in continuous discussions with Israeli and Lebanese counterparts since the horrific attack yesterday in northern Israel that killed a number of children playing soccer," White House National Security Council spokesperson Adrienne Watson said in a statement. "This attack was conducted by Lebanese Hezbollah. It was their rocket, and launched from an area they control. It should be universally condemned."

Hezbollah has denied involvement in the rocket attack in Majdal Shams. But the IDF said a Hezbollah rocket was used in the attack, and U.S. Secretary of State Antony Blinken said earlier Sunday that "every indication" points to Hezbollah as responsible for the strike.

-ABC News' Fritz Farrow