US President Donald Trump says he will send troops to Portland, Oregon, "authorising full force, if necessary" to protect federal immigration facilities from "domestic terrorists" as he expands his controversial deployments to more American cities.

Portland, a Democratic-run city, is one of several so-called sanctuary cities. There is no strict definition for sanctuary cities, but the term generally describes places that limit cooperation with Immigration and Customs Enforcement (ICE).

Mr Trump announced on social media on Saturday, local time, that he was directing the Department of Defense to "provide all necessary troops to protect war-ravaged Portland".

It was necessary to protect ICE facilities , Mr Trump said, which he described as "under siege from attack by Antifa, and other d

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