The National Rifle Association is backing Sen. John CornynJohn CornynSchumer: Congress must stop reported ZTE deal 'in its tracks' Hillicon Valley: Experts worry North Korea will retaliate with hacks over summit | FBI works to disrupt Russian botnet | Trump officials look to quell anger over ZTE | Obama makes case for tighter regs on tech Senate GOP sounds alarm over Trump's floated auto tariffs MORE (R-Texas) in his primary over Rep. Steve StockmanStephen (Steve) Ernest StockmanFormer Texas congressman found guilty of 23 felonies Trump's right — to prevent gun violence, don't disarm our military What Stoneman Douglas activists can learn from Bill Clinton’s assault weapons ban 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.