LONDON (Reuters) - The triple-A ratings of the World Bank and other top multilateral lenders would be at risk if the United States withdraws support for them following a review ordered by U.S. President Donald Trump, credit rating agency Moody's warned.

Last week, Trump signed an Executive Order to review U.S. government support to all international intergovernmental organisations of which it is a member and to withdraw from some United Nations organisations.

"The US is a key shareholder in a number of rated MDBs (multilateral development banks), hence it would be credit negative if it materially reduced its commitment to them," Moody's said in a report published on Monday.