Mehmet Oz, US Republican Senate candidate for Pennsylvania, speaks during a campaign event in Pittsburgh, Pennsylvania, US, on Friday, Sept. 30, 2022.
Two PACs, American Crossroads and the Faith and Power PAC, are respectively pouring $3 million and $3.2 million into Pennsylvania.
Both groups are linked to the Senate Leadership Fund, a super PAC aligned with Republican Senate Minority Leader Mitch McConnell.
The spending, first reported by Politico, will fund ads beginning Tuesday that will last through Election Day on Nov. 8, a spokesman for the Senate Leadership Fund told CNBC.
It also came days after the Senate Leadership Fund abruptly canceled millions of dollars it had reserved in another Senate race in New Hampshire.