Senate Republicans’ campaign arm is launching its first attack in Michigan’s Senate race, targeting Democratic Rep. Elissa Slotkin on pandemic relief spending, according to an ad shared first with NBC News.

Slotkin easily won her party’s primary Tuesday, setting up a race against GOP former Rep. Mike Rogers in November. And Republicans are wasting no time attacking Slotkin, who is in her third term, in a race that will be key to Senate control. 

The National Republican Senatorial…