One of the men Rep. Nancy Mace (R-SC) accused of sexual abuse in a fiery speech on the House floor last month is suing the congresswoman for defamation, a test of legal rules that members of Congress say protect remarks in the chamber.

Brian Musgrave, one of the four men Mace accused of filming acts of sexual assault in a House floor speech last month, sued Mace for libel and defamation in federal court.

Brian Musgrave was out buying bird seed when he got the first hint that his life was about to be turned upside down. The text from someone he didn’t know just said he was going to be mentioned by South Carolina Rep.