“It would be a massive impact on an already catastrophic situation,” said Jamie McGoldrick, who oversaw the U.N. humanitarian operation across Gaza and the West Bank until April. “If that is what the Israeli intention is — to remove any ability for us to save lives — you have to question what is the thinking and what is the end goal?”

UNRWA, the main U.N. agency that aids Palestinians, stands apart from other agencies in the international body. Its 30,000 employees — mostly Palestinians — operate schools, medical clinics, job-training centers, food banks and even garbage collection for six million Palestinians across Gaza, Jordan, Lebanon, Syria and the West Bank.