The Club for Growth raises the specter of past domestic violence accusations against Democratic Sen. Claire McCaskill’s husband in new hard-hitting television advertisement running statewide in Missouri.

The Club for Growth, a conservative advocacy organization, is backing Republican Josh Hawley, the Missouri attorney general, in the state’s hotly contested U.S. Senate race. In a departure for the club, whose advertising typically focuses on fiscal issues, it is attempting to undercut McCaskill’s support among women with an attack tying her voting record in Congress to abuse allegations leveled against her husband, Joseph Shepard, by his ex-wife.