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.

Meetings designed to distribute grant money to fund research were canceled as part of a communications freeze at health agencies.

An email obtained by NPR says NIH employees are subject to a travel freeze and offers of employment are being rescinded. Scientists worry about disruptions to critical research.

President Trump issued a directive temporarily halting communications, meetings and purchases related to federal health care research grants.

The halt has frozen research grants, meetings and key health updates. “Everything is basically in chaos,” said one cancer researcher.

The Trump administration has put a freeze on many federal health agency communications with the public through at least the end of the month

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.