That's what Sheriff Joe Arpaio is urging nearly a quarter-million Arizona gun owners to do to fight terrorism and mass shooters. On Tuesday, the so-called "Toughest Sheriff in America" said he cannot guarantee the public's safety and called on them to take matters into their own hands if necessary. "I'm just talking about the areas where you have large crowds and someone pulls out the gun and starts shooting. Maybe somebody with a concealed weapon takes the guy down," Arpaio said. Specifically, Arpaio was looking to the 250,000 Arizonans who carry concealed weapons permits to help keep the peace.