U.N. Secretary-General Antonio Guterres is visiting Rohingya refugees in Bangladesh as their food rations face drastic cuts amid a funding shortfall, threatening already dire living conditions in the world’s largest refugee settlement.

Rohingya refugees in crammed Bangladeshi camps say they are worried about a U.S. decision to cut food rations by half beginning next month, while a refugee official says the reduction will impact the nutrition of more than 1 million refugees and create social and mental pressure.

U.N. Secretary-General António Guterres has described humanitarian aid cuts by the United States and other countries as “a crime”