The election integrity group True the Vote is suing Pennsylvania Gov. Tom Wolf (D) and Secretary of State Kathryn Boockvar (D), alleging that illegal ballots were counted in four counties across the state in the presidential election.

A lawsuit filed by True the Vote on Tuesday, on behalf of four Pennsylvania voters, alleges that ballots in Philadelphia County, Montgomery County, Delaware County, and Allegheny County were counted in the election despite having been invalid.

The lawsuit asks for ballots from the four counties to be invalidated if it is revealed that a significant number of illegal ballots were counted because such ballots were “mixed in with and cannot be separated from lawful ballots,” according to a True the Vote release.