Trump hints at 'action' if Hamas doesn't return hostage bodies

There are 500 tons of lifesaving aid, including medical equipment and hygiene supplies, for Gaza stuck at the border "due to ongoing bureaucratic delays by the Israeli authorities," according to the International Rescue Committee.

"IRC staff working inside Gaza have shared firsthand accounts of the immense suffering, loss, and resilience of communities. These testimonies reflect the daily reality faced by families across Gaza and underscore the urgent need for the continued reduction of violence and sustained humanitarian action," the IRC said in a statement Wednesday.

This comes one day after the World Food Programme said more border crossings need to be opened to allow in aid at the level needed to keep the famine from spreading.

"IRC staff on the ground report that thousands of displaced people and many who have returned to areas like Gaza City after the ceasefire are still struggling amid massive destruction. With homes reduced to rubble and basic services decimated, families are living without adequate shelter, clean drinking water, food, or sanitation," IRC said.

"Health facilities remain overwhelmed, leaving those in need of medical care unable to access lifesaving services, putting already vulnerable lives at even greater risk," the aid group warned.

Secretary of State Marco Rubio will travel to Israel this week, according to a senior State Department official.

Following the weekend violence in Gaza, several notable administration officials have made their way to Israel to shore up a fragile ceasefire agreement, including Vice President JD Vance, Special Envoy to the Middle East Steve Witkoff, and the president's son-in-law and businessman Jared Kushner.

Israel and Hamas are currently observing a U.S.-backed ceasefire. Questions remain over the deployment of an international security force in Gaza and who will govern the territory. U.S. officials have said they are brainstorming next steps.

-ABC News' Mariam Khan

Vice President JD Vance met with Israeli President Isaac Herzog during his visit to Israel, with the two saying they will continue to work together to insure the ceasefire agreement holds.

“I truly believe that the fact you're here is another brick in building the future for peace,” Herzog said before meeting with Vance.

“We all are grateful to President Donald Trump for his steadfast insistence on moving forward. We must move forward. We must offer hope for the region, for Israel, the Palestinians, our neighbors and for the future of our children. So we are grateful for your efforts,” Herzog added.

-ABC News' Jordana Miller

The International Court of Justice said Israel must allow the United Nations Relief and Works Agency for Palestine Refugees in the Near East, the U.N. aid agency in the Gaza Strip, to provide humanitarian assistance in the enclave, according to an extensive report on the court's official website on Wednesday.

The "occupying Power must allow and facilitate sufficient relief to ensure that population is adequately supplied. UNRWA cannot be replaced on short notice and without proper transition plan," the ICJ wrote in its opinion.

"Israel under obligation to agree to and facilitate relief schemes provided by United Nations and its entities, including UNRWA," the ICJ wrote.

Israel's Foreign Ministry "categorically" rejected the ICJ’s advisory opinion in a statement on its X account, describing it as "yet another political attempt to impose political measures against Israel."

-ABC News' Jordana Miller and Somayeh Malekian