Sarah Palin says she was "duped."

The former Republican vice presidential candidate says she fell victim to British comedian Sacha Baron Cohen during an interview for his upcoming Showtime series, "Who Is America?"

In a Facebook post on Tuesday, the former Alaska governor wrote she and a daughter traveled across the country for what she thought was a legitimate interview. But she says Cohen had "heavily disguised himself" as a disabled U.S. veteran in a wheelchair.

Palin says she sat through what she called a long interview full of "Hollywoodism's disrespect and sarcasm" before she walked out.

She is challenging Cohen and Showtime to donate proceeds from the show to a veterans' charity.

Showtime has no comment. An email seeking comment from Cohen has not been returned.

The show premieres Sunday.