The lawsuit, filed Thursday on Issa’s behalf by conservative advocacy group Judicial Watch, argues that counting vote-by-mail ballots that arrive up to seven days after Election Day violates federal law and directly led to the defeats of two Republican incumbents in last fall’s election.

Rep. Darrell Issa sued the state of California this week to stop mail-in ballots from being counted after Election Day, which he claims provides “an unfair electoral advantage for opponents of Republican congressional incumbents.

U.S. Rep. Darrell Issa, R-Bonsall, sued California on Thursday in an attempt to block the state from counting future mail-in ballots that arrive after Election Day, arguing that “late-arriving (vote-by-mail) ballots tend to favor Democratic candidates and provide an unfair electoral advantage for opponents of Republican congressional incumbents.”