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House Speaker Paul Ryan holds a moment of silence for the ongoing shooting situation in San Bernardino, California, during the annual U.S. Capitol Christmas Tree lighting ceremony on the West Front of the U.S. Capitol in Washington, December 2, 2015 (Credit: AP Images/CQ Roll Call/Al Drago)

House Speaker Paul Ryan holds a moment of silence for the ongoing shooting situation in San Bernardino, California, during the annual U.S. Capitol Christmas Tree lighting ceremony on the West Front of the U.S. Capitol in Washington, December 2, 2015 (Credit: AP Images/CQ Roll Call/Al Drago)