Donald Trump Jr. feuded with Sen. Jeff Flake, R-Ariz., on Twitter on Tuesday, saying the lawmaker “failed” to do his job and prevent the shooter responsible for the deadly church shooting in Texas from purchasing a firearm.

The dispute began after Flake tweeted about crafting a bill with Sen. Martin Heinrich, D-N.M., that would close loopholes and prevent those convicted of domestic violence from obtaining firearms.

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