The United Nations will do all it can to help prevent food rations being cut for Rohingya refugees in camps in Bangladesh, U.N. Secretary-General Antonio Guterres said on Friday during a visit to the world’s largest refugee settlement.

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

The US has been the largest provider of aid to the Rohingya refugees, contributing nearly $2.4 billion since 2017, according to a State Department website.