The Egyptian-crafted alternative to Trump's widely condemned takeover proposes to rebuild the Gaza Strip under the future administration of the Palestinian Authority.
Hamas said Trump's threats would encourage Israel to ignore the deal, which largely halted more than 15 months of war in Gaza between Israel and Palestinian militants.
Foreign ministers from the 57-member Organisation for Islamic Cooperation (OIC) will meet at its headquarters in Jeddah, Saudi Arabia, three days after the Arab League endorsed Egypt's alternative plan for Gaza.
In the midst of the Israel-Hamas war, a young Israeli soldier, held captive for over a year, surprises the world by kissing the foreheads of his captors before his release.
US President Donald Trump's forceful backing of ally Israel has put the ceasefire under strain, and particularly his proposal to take over the Gaza Strip and remove its Palestinian inhabitants.
After the ceasefire came into force, Trump touted a plan to "clean out" the Gaza Strip, reiterating the idea on Monday as he called for Palestinians to move to "safer" locations such as Egypt or Jordan.
Israel had been preventing vast crowds of Palestinians from using a coastal road to return to northern Gaza, accusing Hamas of violating the truce agreement by failing to release civilian women hostages.
As the ceasefire took effect on Sunday morning, thousands of displaced, war-weary Palestinians set off across the devastated Gaza Strip to return home.
