Washington — President Trump announced on social media Wednesday that he's designating antifa as a "major terrorist organization." But what that action would mean 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.

The president's announcement comes as he and his supporters continue to denounce "radical left wing political violence" following the assassination of conservative activist Charlie Kirk last week. After Kirk's killing , Mr. Trump blamed rhetoric from the "radical left," saying that it is "directly responsible for the terrorism that we're seeing in our country today, and it must stop right now."

Officials described the

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