Beto O’Rourke slammed Democratic presidential primary rival Pete Buttigieg over the South Bend, Indiana, mayor’s refusal to support “mandatory buyback” confiscation of military-style firearms and accused Buttigieg of being “calculating.”

Both candidates appeared at a gun violence forum in Las Vegas on Wednesday hosted by March For Our Lives, a gun control group formed after a February 2018 school shooting in Parkland, Florida, which killed 17 people.

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