Residents of Nevada, a key battleground state that may determine if Republicans gain the majority in the next Senate, will see a multimillion-dollar ad campaign for GOP candidate Jeff Gunter that will air in major television markets such as Reno and Las Vegas.

Gunter, the former ambassador to Iceland in the Trump administration, purchased $3.3 million in television, radio, texting, and digital advertising ahead of the state’s June 11 primary.