The Secretary-General of the United Nations, Antonio Guterres, on Monday expressed worries after the United States, the world’s biggest foreign aid donor, froze virtually all assistance under President Donald Trump’s new administration.

United Nations Secretary-General Antonio Guterres on Monday called for the United States to consider additional exemptions to a 90-day pause on its foreign assistance to "ensure continued delivery of critical development and humanitarian activities.

The US is the world's biggest foreign aid donor and announced sweeping changes to overseas aid on Friday, days into Trump's new term.

Iran must make a first step towards improving relations with countries in the region and the United States by making it clear it does not aim to develop nuclear weapons, U.N. Secretary-General Antonio Guterres said on Wednesday.