Trump's administration also told federal health agencies to stop most communications with the public through at least the end of the month.

Experts said the sudden stoppage was a surprise and would set back work on investigating and trying to stop outbreaks and brewing global threats.

CDC official John Nkengasong, sent a memo to senior leaders at the agency ordering them to cut off all communications with the WHO and “await further guidance" in compliance with President Trump's exe

A U.S. Centers for Disease Control and Prevention official, John Nkengasong, sent a memo to senior leaders at the agency on Sunday night telling them that all staff who work with the WHO must immediately stop their collaborations and “await further guidance.