WASHINGTON (AP) — President Donald Trump’s son-in-law and negotiator Jared Kushner will travel to the Middle East next week to try to advance plans for an end to the conflict in Gaza after a deal recently announced by the Trump administration ran into Israeli opposition.

An official with the Board of Peace, the body Trump established to oversee the fragile ceasefire in the Israel-Hamas war, said Kushner, board high representative Nickolay Mladenov, and executive board member and former British Prime Minister Tony Blair would arrive in Israel on Sunday.

The group will then travel to Cairo, where meetings of a Palestinian technocratic group set to assume control of Gaza under a U.S.-brokered ceasefire deal have been taking place for the past several months, the official said. The trip was reported earlier by Axios.

The official, who spoke on condition of anonymity because planning for details of the trip has not yet been finalized, said the meetings would demonstrate the determination of Trump and the Board of Peace to “see peace, prosperity and sustainable security emerge” in a demilitarized Gaza where Hamas has ceded control to allow reconstruction of the devastated territory.

But Israel has dismissed a recent deal announced by Trump for Hamas to disarm and Israel to withdraw its forces from the Palestinian territory, marking a rare public display of friction with the Trump administration. Though Hamas accepted the plan to decommission its weapons, Prime Minister Benjamin Netanyahu said in recent days that Israel would not withdraw until Hamas has completely disarmed.

The deal had been seen as a potential breakthrough for ending the war in Gaza. The agreement was based on an October ceasefire that ended major military operations and brought about the release of the remaining hostages held in Gaza, but it has stalled on other fronts.