President Obama pauses as he speaks about gun violence at the Annual Meeting of the U.S. Conference of Mayors in San Francisco in this June 19, 2015, file photo. (AP Photo/Carolyn Kaster)
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President Obama pauses as he speaks about gun violence at the Annual Meeting of the U.S. Conference of Mayors in San Francisco in this June 19, 2015, file photo. (AP Photo/Carolyn Kaster)
