As outrage over the murder of Saudi dissident Jamal Khashoggi in Istanbul by Saudi operatives fused with concern about Yemen, a wave of disquiet swept Washington amid accusations that the US military could be complicit in war crimes.
Thousands of having died in the fighting and millions are in dire need of aid. Pompeo said in a statement that he had certified that the Saudi and Emirati governments "are undertaking demonstrable actions to reduce the risk of harm to civilians and civilian infrastructure."
The study by London's Queen Mary University found eight out of 10 cholera deaths took place in regions controlled by Iran-backed Houthi rebels who have fought a two-year war against Saudi-aligned forces backing Yemen's government.
Yemen's civil war intensified sharply almost a year ago when a Saudi-led Arab coalition intervened with air strikes, a naval blockade and ground troops to counter Houthi rebels intent on seizing the whole country.