In 2023, while Kristi Noem was governor of South Dakota, she supplemented her income by secretly accepting a cut of the money she raised for a nonprofit that promotes her political career, tax records show.

In what experts described as a highly unusual arrangement, the nonprofit routed funds to a personal company of Noem’s that had recently been established in Delaware. The payment totaled $80,000 that year, a significant boost to her roughly $130,000 government salary. Since the nonprofit is a so-called dark money group — one that’s not required to disclose the names of its donors — the original source of the money remains unknown.