Some attendees at Donald Trump’s speech about the autoworkers’ strike Wednesday apparently were shills carrying signs falsely identifying them as union members, the Detroit News reported.

One person held a sign that said “union members for Trump,” but admitted to the newspaper she was not a union member. Another carried a placard with the words “auto workers for Trump” and confessed he was not an auto worker when the outlet requested an interview. Neither identified themselves.

The affiliations of the guests receiving his message came into question. The business, Drake Enterprises in suburban Detroit, employs about 150 people who are not represented by the UAW, the newspaper noted. And there were an estimated 400 to 500 in attendance.