A complaint has been lodged with the Federal Election Commission, accusing a group aligned with Senate Majority Leader Chuck Schumer (D-NY), which has spent millions in targeting Tim Sheehy, a Republican candidate vying for Montana’s Senate seat, of failing to file independent expenditure reports.

On Monday, the Americans for Public Trust filed an FEC complaint against the Last Best Place PAC, a shadowy entity behind a multimillion-dollar TV advertising campaign attacking Sheehy, who could be facing Rep. Matt Rosendale (R-MT) in a challenge to Sen. Jon Tester (D-MT). Last Best Place PAC was registered in September and spent $5.7 million in broadcast and cable ads targeting Sheehy, a Gallatin County businessman and Navy veteran.

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