Sen. Rob Portman won the endorsement of retired four-star Gen. Barry McCaffrey Friday, and his campaign announced that the former “drug czar” for former President Bill Clinton cut an ad for him that is set to run immediately.

McCaffrey praised the Ohio Republican in the ad as one of the “finest public servants” he’s met, and lauded him for his work to help fight the ongoing heroin epidemic, which has become a major issue in Ohio. Portman co-sponsored the Comprehensive Addiction and Recovery Act, a bipartisan bill aimed at prevention and treatment for opioid addiction.