The Pentagon on Monday said it was investigating Democratic Sen. Mark Kelly (Ariz.) — a retired naval officer who recently clashed with President Trump — over "serious allegations of misconduct."

Why it matters: Kelly is part of a group of Democratic lawmakers who last week posted a video calling on military service members to disobey unlawful orders. Trump demanded that the lawmakers be "ARRESTED and PUT ON TRIAL." • A statement from the Pentagon on Monday did not specify the nature of the allegations but said all service members have a "legal obligation" to "obey lawful orders and that orders are presumed to be lawful." • A representative for Kelly did not immediately respond to a request for comment.

The big picture: Democrats rallied around Kelly and colleagues last week after Tr

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