A Mitch McConnell-linked Senatorial Republican Super PAC has pulled millions of dollars in ad buys in Arizona, where Trump-backed Blake Masters will likely face a tight race in November.

The Senate Leadership Fund, a group aligned with Senate Minority Leader Mitch McConnell, is cancelling ad buys worth nearly $8 million in Arizona, where Masters is running, set for early fall. The ads are about half of what the super PAC bought, leaving the rest to start in early October, according to Politico. (RELATED: Blake Masters Wins Arizona Republican Senate Primary)

Masters, who is backed by PayPal co-founder and Republican donor Peter Thiel, will run against incumbent Democratic Sen. Mark Kelly in what is considered a “toss up” race by Cook Political Report. Kelly is beating Masters in most polls, with his lead averaging 8.3 percentage points, according to FiveThirtyEight.

The Trump-aligned candidate said Friday he hopes to get McConnell’s support.