Republican candidate for lieutenant governor Sen. Dan Patrick is out with his second attack ad in less than a week. This time, he’s going after Lt. Gov. David Dewhurst on immigration. He accuses Dewhurst of failing to secure the border and allowing the Senate to expand in-state tuition and free healthcare for illegal immigrants on his watch.

The ad started airing this morning on Fox News in 14 Texas markets. You can watch the ad here:

Dewhurst and Patrick are facing off in the Republican primary runoff election on May 27. The winner will take on Democratic Sen. Leticia Van de Putte in November.