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Washington’s withdrawal is the latest dramatic exit in a long string of US rejection of multilateral engagements.

Most recently, the US pulled out of the Paris climate agreement and the 2015 Iran nuclear deal.

This decision on human rights comes amid fierce criticism of President Trump’s Mexico border policy.

Children are being separated from immigrant parents at the US-Mexico border and detained, in what UN human rights chief Zeid Ra'ad al-Hussein called an "unconscionable" policy.

Mexican Foreign Minister Luis Videgaray Caso said the separation of children from parents at the US border was "cruel and inhuman", and clearly violated human rights.

Mr Trump has defended the policy, taking to Twitter to say the US needed to stop allowing immigrants "to pour into and infest our country."