Senate Republican's attack on GOP rival immediately backfires

The campaign communications chief for Sen. John Cornyn (R-TX) launched an explosive allegation that primary rival Rep. Wesley Hunt illegally voted in 2016, and the post may have landed the Cornyn campaign in hot water.

The allegation, brought by staffer Matt Mackowiak, was that Hunt lied to election officials in a sworn statement on a provisional ballot in 2016 about the date of his discharge from military service, so that he could cast a vote in an election he was not registered for.

“Wesley...