Former Rep. Beto O’Rourke of Texas is on a mission: Revive his failing presidential campaign by exploiting mass shootings to campaign for gun control. The candidate is proposing to restrict private gun sales, ban “assault weapons,” and more. But O’Rourke’s ideas aren’t so popular back home.

Texas lawmaker Matt Schaefer offered up a unique counter-argument against expanding background checks, sparking controversy when he tweeted: “Ending private gun transactions like Beto wants to do will hit undocumented people hard. It will make vulnerable people less safe,” as part of a larger thread on the importance of gun rights for self-defense.