Aides to Republican Tommy Thompson—the former Wisconsin governor, onetime Akin Gump Strauss Hauer & Feld partner, and current candidate for the U.S. senate—said Monday that Thompson’s son, Jason, an attorney at Milwaukee-based Michael Best & Friedrich, “said something he should not have” when he remarked that voters should send President Barack Obama back to Kenya.

The controversial comment, which was caught on camera, came at a Sunday brunch held by the Kenosha County Republican Party in Wisconsin. At one point during the event, Jason Thompson tells potential voters that they “have the opportunity to send President Obama back to Chicago—or Kenya.”