Donald Trump has ordered the deployment of troops to Portland, Oregon, authorising use of "full force" if needed, to suppress protests targeting immigration detention centres.

The US president claimed the move would help protect "any of our ICE Facilities under siege from attack by Antifa, and other domestic terrorists", characterising the city as "War ravaged" in a Truth Social post.

The announcement marks a further expansion of troop deployments in US cities, amid a wider crackdown by the Trump administration on illegal immigration.

The latest move has drawn pushback from Democratic lawmakers, who said there was no need for federal troops to be deployed to Portland.