Rep. Steve StockmanSteve StockmanWhy Republicans took aim at an ethics watchdog Cruz will skip State of the Union Ethics: Lawmakers didn’t ‘knowingly’ break rules with Azerbaijan gifts MORE (R-Texas) tweeted a photo Monday of what he called “the best gun lubricant around.”

Stockman, who’s running against incumbent Sen. John Cornyn (R-Texas) next year, tweeted a photo showing a can labeled “liberal tears” spraying a gun.

Stockman strongly opposes gun control and even threatened to impeach President Obama last January for announcing gun control-related executive orders.

“The right to keep and bear arms is granted by God and protecting from government aggression by the Constitution,” Stockman said in a statement earlier this year.