President Donald Trump called for a new era of harmony in the Middle East on Monday during a global summit on Gaza's future, trying to advance broader peace in the region after visiting Israel to celebrate a U.S.-brokered ceasefire with Hamas.

“We have a once-in-a-lifetime chance to put the old feuds and bitter hatreds behind us," Trump said, and he urged leaders “to declare that our future will not be ruled by the fights of generations past.”

The whirlwind trip, which included the summit in Egypt and a speech at the Knesset in Jerusalem earlier in the day, comes at a fragile moment of hope for ending two years of war between Israel and Hamas.

Nearly three dozen countries, including some from Europe and the Middle East, are represented at the summit. Israeli Prime Minister Benjamin Netanyahu was invited but declined, with his office saying it was too close to a Jewish holiday.

Trump, el-Sissi, Turkish President Recep Tayyip Erdogan and Qatari Emir Tamim bin Hamad Al Thani signed a document that Trump said would lay the groundwork for Gaza's future. However, a copy was not made public.

Despite unanswered questions about next steps in the Palestinian enclave, which has been devastated during the conflict, Trump is determined to seize an opportunity to chase an elusive regional harmony.

Twenty hostages were released Monday as part of an agreement intended to end the war that began on Oct. 7, 2023, with an attack by Hamas-led militants.