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

In line with Trump's executive order to end all collaboration with the WHO, the CDC has been instructed to end all communications and work with the international public health agency.

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.