(L.A. Times) -- The United States has made significant gains against terrorism. We've decimated the core al Qaeda leadership, strengthened homeland security and worked to prevent another large-scale attack like 9/11.
At the same time, the threat has evolved. The al Qaeda affiliate in Yemen actively plots against us. Since 9/11, terrorists have murdered U.S. citizens overseas, including in the attacks in Benghazi, Libya. Here in the United States, Americans have been killed at Ft. Hood and during the Boston Marathon.
In Syria and Iraq, the terrorist group we call ISIL has slaughtered innocent civilians and murdered hostages, including Americans, and has spread its barbarism to Libya with the murder of Egyptian Christians. In recent months, we've seen deadly attacks in Ottawa, Sydney, Paris and Copenhagen.
Advertisement - story continues below