U.S. Central Command and the Royal Jordanian Air Force conducted a combined humanitarian assistance airdrop into Northern Gaza on Sunday.

The combined joint operation included Jordanian provided food and four U.S. Air Force C-130 aircraft.

The U.S. C-130's dropped over 25,000 Meals Ready to Eat (MREs), providing life-saving humanitarian assistance in Northern Gaza. Additionally, more than 13,080 meal equivalents of Jordanian food supplies were also delivered.

To date the U.S. has dropped nearly 1,110 tons of humanitarian assistance.

-ABC News’ Nate Luna

Hanna Siegel, niece of American hostage Keith Siegel, appeared on CBS' "Face the Nation" on Sunday morning and talked about the "surreal" feeling of seeing a recently released video purporting to show her uncle and talked about the possibility of a deal that would free him and other people thought to still be held by Hamas in Gaza.

"We've always believed that he was alive. We have to believe he's alive -- and his wife, my aunt, who was held for 52 days, [was] released in the deal that took place in November, she was with him," Siegel said. "When she came out, she told us he was alive, but this is the first time that we're seeing him, hearing him. It's surreal."

When asked about a potential hostage deal and temporary cease-fire between Israel and Hamas, Siegel said that she does think an agreement "can be reached" and pointed to an earlier deal that secured the release of her aunt and others during a brief pause in the war late last year.

Siegel also said that she believes the new release of purported hostage videos shows that Hamas is signaling they are ready to make a deal.

But she said that she is concerned that it might not be in Israeli Prime Minister Benjamin Netanyahu's "political interest to close a deal," though Netanyahu has said his goal is freeing the captives in Gaza as well as dismantling Hamas.

Siegel said that the Biden administration should "think about what they can do directly to bring our American citizens home."

She also said she has felt the "commitment from the Biden administration to get him back," referring to her uncle.

She became emotional talking about how her family missed her uncle during their Passover celebration and had a picture of him to pay tribute.

"I think there's so much swirling in the political realm that it's easy to forget that these are human beings. Keith is a grandfather, he's a husband, he's a brother, he's an uncle," she said.

She was asked whether her family is worried if a potential Israeli invasion of the Gaza city of Rafah, to further target Hamas fighters, could threaten her uncle's safety. She responded that she and her family are "very concerned."

-ABC News' Michelle Stoddart

Hamas will send a delegation to Cairo, Egypt, on Monday to participate in hostage and cease-fire deal negotiations, ABC News has confirmed.

Meanwhile, a senior Hamas official also told the Agence France-Presse on Sunday that the organization has no significant problems with the proposed deal.

"The atmosphere is positive unless there are new obstacles from the Israeli side," the Hamas official said.

-ABC News' Nasser Atta and Yael Benaya

President Joe Biden and Israeli Prime Minister Benjamin Netanyahu spoke Sunday in a phone call, according to the White House.

The two leaders "reviewed ongoing talks to secure the release of hostages," discussed increasing the delivery of humanitarian aid into Gaza and discussed plans for a possible military operation in Rafah, according to a White House readout of Sunday's call.

According to the readout, Biden pointed to a statement he and 17 other world leaders released Thursday calling for Hamas to release the hostages and secure a cease-fire in Gaza.

"The President and the Prime Minister also discussed increases in the delivery of humanitarian assistance into Gaza including through preparations to open new northern crossings starting this week," the White House readout of the call said. "The President stressed the need for this progress to be sustained and enhanced in full coordination with humanitarian organizations."

The readout also said Biden "reiterated his clear position" on a military operation in Rafah.

During the call, Biden also "reaffirmed his ironclad commitment" to Israel's self-defense after an Iranian attack earlier this month, the White House said.

-ABC News' Michelle Stoddart

The World Central Kitchen said it will resume operations in Gaza on Monday.

"The humanitarian situation in Gaza remains dire," CEO Erin Gore said Sunday in a press release. "We are restarting our operation with the same energy, dignity and focus on feeding as many people as possible. To date, we have distributed more than 43 million meals, and we are eager to deliver millions more."

"We will continue to get as much food into Gaza, including northern Gaza, as possible -- by land, air or sea," Gore added, in part.

Chef José Andrés' aid group had paused operations on April 2, when seven workers were killed in Gaza during an Israel Defense Forces drone strike, the food-relief organization has said.

Andrés, in an exclusive sit-down interview with "This Week" co-anchor Martha Raddatz earlier this month, said the strike is "unforgivable" and that Israel is committing a "war against humanity itself."

An investigation by the Israeli military into how the WCK strike occurred found that the decision to hit the aid convoy was a "serious violation" of their rules. It noted in its report the team that carried it out lacked sufficient evidence to do so, twice violating operating rules. In response, the IDF said it dismissed two officers, suspended two commanders and reprimanded three others. An Israeli military spokesman said it was "a terrible chain of errors, and it should never have happened."

Israeli officials have repeatedly defended their military operations in Gaza, insisting they take steps to curb civilian deaths while allowing aid to flow in that cannot benefit Hamas.