The National Rifle Association is backing Sen. John CornynJohn CornynAfter Texas shooting, lawmakers question whether military has systemic reporting problem Overnight Defense: Lawmakers question military's lapse after Texas shooting | Trump asks North Korea to 'make a deal' | Senate panel approves Army pick Overnight Regulation: House passes bill to overturn joint-employer rule | Trump officials to allow work requirements for Medicaid | Lawmakers 'alarmed' by EPA's science board changes MORE (R-Texas) in his primary over Rep. Steve StockmanSteve StockmanEx-GOP staffer pleads guilty to fraud, money laundering on behalf of ex-lawmaker Cornyn to run for reelection in 2020 Former congressman indicted on conspiracy charges MORE (R-Texas).

Cornyn has long been a staunch opponent of gun control, and has recently pushed laws to allow concealed carry permits to be valid across state lines. The endorsement comes despite Stockman's enthusiastic gun support — he's gone as far as raffling off a semi-automatic assault rifle for his campaign.

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"John Cornyn is a consistent and passionate champion of our Second Amendment rights," said NRA Political Victory Fund Chairman Chris Cox. "The choice is clear for law-abiding gun owners and sportsmen in the U.S. Senate Republican primary election in Texas, and that choice is John Cornyn."

Cornyn appears to have a huge advantage in the race. He has $7 million in the bank and has given Stockman little room to attack him from the right. Stockman has just $32,000 in his warchest and carries five times that amount in campaign debt as of the last filing period.

The NRA endorsement makes it the second conservative group this week to back Cornyn over Stockman; the Texas Alliance for Life endorsed him on Monday. No major conservative groups have stepped up for Stockman at this point, and the Club for Growth, the heaviest hitter on the right, has said it won't get involved in the race.