Egypt’s foreign minister stressed on Monday the success of U.S. President Donald Trump’s vision for peace in the Middle East would be dependent on his continued commitment to the issue and applying pressure on both Israel and Hamas.

Badr Abdelatty said Monday it was crucial that mediators ensure Israel and Hamas fully implement the first phase of the ceasefire deal so both parties, with international backing, can begin negotiations on the second phase.

"Phase two is more difficult, more complicated, and we have to keep President Trump engaging and that's very, very important because it's all about his engagement," Abdelatty told The Associated Press.

"It's all about his vision and he's the one who's able to deliver and to end this war and to bring an end to the whole conflict of in the Middle East."

His comments come as the U.S. and Egyptian presidents are set to chair a gathering of world leaders dubbed “Summit for Peace” on Monday to support ending the more than two-year Israel-Hamas war in Gaza after the breakthrough ceasefire deal.

Israel and Hamas have no direct contacts and were not expected to attend Monday's summit.

The Israeli prime minister's office said Benjamin Netanyahu will not travel to the venue because of a Jewish holiday.

Israel has rejected any role in Gaza for the internationally backed Palestinian Authority, whose leader, Mahmoud Abbas, arrived in the Egyptian Red Sea resort town of Sharm el-Sheikh early on Monday afternoon, ahead of the gathering.

The summit comes as Hamas released 20 remaining living Israeli hostages and Israel started to free hundreds of Palestinians from its prisons, crucial steps after a ceasefire began on Friday.

But major questions remain unanswered over what happens next, raising the risk of slide back into war — even as the world pushes for peace.