Washington — President Trump signed an executive order Monday labeling antifa as a "domestic terrorist organization" after teasing the move last week. But what that action means for the movement remains unclear, given that antifa has no official leadership or organization structure, and the president lacks authority to designate domestic terrorist organizations, experts say.

Mr. Trump's executive order directs the federal government to use "all applicable authorities to investigate, disrupt, and dismantle" illegal operations conducted by antifa or any purported adherent, including taking investigatory or prosecutorial action against those who provide funding.

The president's move came as he and his supporters have continued to denounce "radical left wing political violence" following the

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