Palestinian President Mahmoud Abbas on Monday intensified efforts to rally Middle Eastern countries against U.S. recognition of Jerusalem as Israel’s capital, setting up talks with Arab leaders beginning in Cairo, Reuters reported.

Abbas will meet President Abdel Fattah al-Sisi of Egypt, which has been a key broker in past peace talks with Israel and between fighting Palestinian factions, before heading for Istanbul to give a speech, his office said.

Abbas met the head of the Arab League in Cairo on Monday, local media reported. Arab foreign ministers held an hours-long emergency meeting at the weekend and vowed to seek a U.N. Security Council resolution rejecting the U.S. move, but gave few details on other measures they would take.

The Palestinians hope for concrete action.

“Daring Palestinian and Arab decisions are required in the coming stage, which is very important,” Abbas’s spokesman Nabil Abu Rdainah told Palestinian official news agency WAFA.

World powers have said the U.S. move will impede peace efforts in the decades-long Israeli-Palestinian conflict as anger spreads across the region.

The Trump administration says it is still committed to the peace process.

Abbas will not meet Mike Pence during the U.S. Vice President’s visit to the region later this month, Palestinian Foreign Minister Riyad al-Maliki said on Saturday.