When US President Joe Biden came to Israel his meetings with the Jordanians, Egyptians and the Palestinian Authority were cancelled after Hamas falsely claimed a hospital in Gaza was attacked.
Here's who's planning to attend.
The fire appeared mainly confined to the top floor of the Ministry of Religious Endowments, although flames were seen shooting out of a second floor window as well.
Abbas is also hoping to persuade Hamas to join a new Palestinian unity government that would end the split between the West Bank and Gaza Strip.
Abbas had invited the leaders of the factions to the meeting in response to the Israeli military operation in the Jenin Refugee camp earlier this month.
The visit comes amid reports about a possible rapprochement between Egypt and Iran, which has long been backing Hamas and PIJ.
Turkish Foreign Minister Mevlut Cavusoglu told private broadcaster A Haber that his counterpart would come soon, with details to be given on Wednesday.