Scientists are planning a march against Donald Trump after his administration enforced what is said to be a temporary media blackout on the Environmental Protection Agency.

The organisation's social media accounts have been silent since Friday's inauguration.

The new rules ban staff from publishing social media posts, press releases or blog posts and stops them publicising publicly-funded research.

"A fresh look at public affairs and communications processes is common practice for any new Administration," a statement from the EPA's office of public affairs said.