Did Alex Pretti’s killing open a GOP rift on guns?

Alex Pretti was legally carrying a handgun when federal immigration agents shot him to death in Minneapolis. Does that make him culpable for his own death? White House officials have tried to make that case. “You can’t walk in with guns” when protesting the government, President Donald Trump told reporters on Tuesday. That has angered gun rights organizations that are usually allied with the GOP.

The Trump administration is facing a “Second Amendment backlash” after Trump and other officials...