The US Agency for International Development (USAID) has officially closed its doors after President Donald Trump gradually dismantled the agency over its allegedly wasteful spending.

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More than 80% of all the agency's programmes were cancelled as of March, and on Tuesday, July 1, the remainder were formally absorbed by the state department, BBC reported.

The shuttering of USAID - which administered aid for the US government, the world's largest such provider - has been newly criticised by former Presidents Barack Obama and George W. Bush.

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These aid cuts could cause more than 14 million additional deaths by 2030, according to a warning published by researchers in the Lancet medical journal.

Read the full report here.