At least 200 National Guard members will be deployed to the city to "protect federal property" where protests are "occurring or likely to occur", according to a memo sent by US Defence Secretary Pete Hegseth on Sunday.

Trump on Saturday said he had authorised the use of "full force" if needed to suppress protests targeting immigration detention centres.

Oregon has responded by suing the Trump administration, arguing that the deployment of the National Guard to Portland is "unlawful".