WASHINGTON (AP) — Democratic lawmakers who appeared in a video urging members of the military to resist “illegal orders” confirmed Wednesday that they are under investigation from the Trump administration, a remarkable step by the Justice Department that comes after the president accused the lawmakers of sedition for their words.

The four House members and two senators all previously served in the military or at intelligence agencies. The FBI contacted them for interviews late last year, after their 90-second video was released, and now say they have been contacted by the U.S. attorney’s office for the District of Columbia, a significant escalation in the investigation.

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