The parents of a child killed in the December 2012 Sandy Hook massacre slammed Sen. Bernie Sanders Saturday for his defense of a gun manufacturer that marketed the semi-automatic weapon used in the attack.

"Sanders has spent decades tirelessly advocating for greater corporate responsibility, which is why we cannot fathom his support of companies that recklessly market and profit from the sale of combat weapons to civilians and then shrug their shoulders when the next tragedy occurs, leaving ordinary families and communities to pick up the pieces," Mark Barden and Jackie Barden in Washington Post op-ed Saturday.

Their son Daniel, 7, was one of 20 children and six adults killed in the mass shooting.

Sanders said at a Democratic debate in Michigan this month that he opposes a lawsuit brought by the Bardens and nine other families of Newtown victims.

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