Trump has frozen all travel and communications at the Department of Health and Human Services, including the CDC and the National Institutes of Health

Federal health officials have been instructed to temporarily stop any “external communications” to the public, according to two officials with knowledge of the situation.

The Trump administration ordered an immediate pause on public communications from federal health agencies like the CDC, FDA, and NIH. The U.S. Department of Health and Human Services (HHS) says it expects the pause to be temporary.

The Trump administration told federal public health agencies like the CDC that they are not to communicate health messages for now. The hold includes memos, reports, online posts, website updates and other forms of communication. Scientific meetings were also canceled for the time being, including of advisory panels.

A new memo by NIH Acting Director Matthew Memoli, obtained by Forbes, clarifies what can and can’t be done with regard to clinical trials, purchasing, research and the like.

Despite concerns about the future of research at the National Institutes of Health, current clinical trials can continue as scheduled, the agency’s acting director told staff scientists in an email Monday.