US President Donald Trump has promised "very threatening" steps against antifa and asked right-wing media allies for help identifying backers of the movement he has told the federal government to treat as a "terrorist organisation".

Nearly a month after the assassination of right-wing activist Charlie Kirk, Trump on Wednesday threatened action against left-wing groups and donors with no demonstrated ties to the killing.

The Republican president has also moved to push federal law enforcement and troops into Democratic-run cities from Chicago to Portland, Oregon, over the objections of local officials and despite ongoing judicial review.

Trump welcomed supportive media personalities to a White House event on Wednesday to discuss their experiences with what they described as a rash of viol

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