Sullivan said Biden also needs to speak with Egyptian President Abdul Fattah al-Sisi.
The latest developments come as Netanyahu faces fierce opposition to a potential deal within his ruling coalition. Ten right-wing members, including some from Netanyahu’s Likud party, sent him a letter opposing the truce.
A Palestinian official told the BBC that Hamas and Israeli officials held indirect talks in the same building on Monday.
Revealing some potential details of the agreement, the official said that “detailed technical discussions took a long time.”
Both sides agreed that Hamas would release three hostages on the first day of the deal, after which Israel would begin withdrawing troops from populated areas.
Seven days later, Hamas will release four more hostages, and Israel will allow displaced people in the south to return to the north, but only on foot along the coastal road. Cars, carts and trucks would be allowed to pass through the passage along Salah al-Din Road, under the supervision of an X-ray machine operated by a Qatari-Egyptian technical security team.
The agreement includes provisions for Israeli forces to remain in the Philadelphia Corridor and maintain an 800-meter buffer zone along the eastern and northern borders during the first phase, which will last 42 days.
Israel also agreed to release 1,000 Palestinian prisoners, including approximately 190 serving sentences of 15 years or more. In exchange, Hamas will release 34 hostages.
Negotiations for the second and third phases of the agreement would begin on the 16th day of the ceasefire.
Meanwhile, the Gaza Civil Defense Agency reported that a wave of Israeli airstrikes on Gaza City on Monday killed more than 50 people.
“They bombed schools, homes and even gatherings of people,” civil protection spokesman Mahmud Bassal told AFP.
The Israeli military said it was looking into the reports. Separately, it said five soldiers were killed on Monday in the northern Gaza Strip.
The war was triggered by a Hamas attack on southern Israel on October 7, 2023, in which around 1,200 people were killed and 251 others taken to Gaza as hostages.
In response, Israel launched a military offensive in Gaza to destroy Hamas.
Gaza’s Hamas-run health ministry says more than 46,500 people have been killed during the war.
Israel says 94 hostages remain in Gaza, 34 of whom are presumed dead, as well as four other Israelis who were abducted before the war, two of whom are dead.
