AT had a chance to catch up with Steven Emerson, head of The Investigative Project on Terrorism, and hear his assessment of the ISIS threat here on American soil. Emerson runs the country's top data center on Islamic terror groups in the United States, working like a man possessed, and accomplishing the work of thousands on sheer guts and determination to protect our country. Wherever the bad guys have been caught and prosecuted successfully, you will find Emerson working quietly behind the scenes as an invaluable ally of the FBI and Homeland Security. Because he accepts no money from the...