LAS VEGAS (AP) – Beto O’Rourke is accusing one of his rivals for the Democratic presidential nomination of being “afraid of doing the right thing right now” when it comes to guns.

O’Rourke, a former Texas congressman, was speaking about South Bend, Indiana, Mayor Pete Buttigieg. Both attended a gun policy forum Wednesday in Las Vegas.

O’Rourke supports a mandatory government buyback program for assault-style weapons. Buttigieg says such a policy has “mixed results” and likened it to a “shiny object” that makes it harder to pass other gun control policies now.

O’Rourke says that many Americans support gun buyback and that “it’s time to lead.”

O’Rourke himself was criticized earlier in the day by New Jersey Sen. Cory Booker, who said O’Rourke only supported a gun licensing program after the shooting in his hometown of El Paso, Texas.

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