A major Republican political action committee backed by Senate Minority Leader Mitch McConnell is pulling its funding from the crucial battleground state of Arizona, according to a new report.

As revealed by Politico, “The Senate Leadership Fund [SLF], which is aligned with Minority Leader Mitch McConnell, is scrapping roughly $8 million in ads — about half of its initial Arizona reservation — that were supposed to start in the early fall,” with the super PAC now set to begin airing ads in Arizona in early October.

“In November [Republican Senate nominee Blake] Masters will face Sen. Mark Kelly (D-Ariz.), who already enjoys a heavy financial advantage down the stretch,” the report reads. “The super PAC’s move will exacerbate that Kelly edge as Republicans seek to net the one seat needed to take back Senate control.”

In defense of the decision, SLF President Steven Law told Politico that while the group is “leaving the door wide open in Arizona,” they also want to “move additional resources to other offensive opportunities that have become increasingly competitive.”