Texas Attorney General Ken Paxton is going hard after Senator John Cornyn in the GOP primary, framing Cornyn as a weak incumbent who cannot run on his own votes.

• Paxton calls Cornyn one of the nastiest opponents he has faced and says Cornyn relies on personal attacks because he has nothing positive to run on.
• The pitch: after 42 years in office, Cornyn should be defending his record, not smearing rivals.
• Paxton hits Cornyn for siding with Biden on gun legislation and on bringing Afghan refugees into the US without proper vetting.
• He also points to Cornyn fighting Trump over the border wall as proof Cornyn is out of step with Texas Republicans.

Outlook: Expect the Texas Senate primary to stay personal and ugly, with Paxton pushing the "Cornyn is a Biden ally" frame to peel off the Trump base.