The U.N. Palestinian refugee agency is close to a possible breaking point for its operations in the Gaza Strip due to increasingly complicated conditions, its head said on Wednesday.

U.S. Ambassador to the United Nations Linda Thomas-Greenfield is pushing back on Israel’s efforts to stymie the United Nations Relief Works Agency from operating within its borders. Her comments come days after the Israeli Knesset’s Foreign Affairs and Defense Committees approved two bills designed to bar the U.