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SAN BERNARDINO, CA - DECEMBER 02:  SWAT officers enter an area where suspects were believed to be after the shooting at the Inland Regional Center on December 2, 2015 in San Bernardino, California.  Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured.   (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 02:  SWAT officers enter an area where suspects were believed to be after the shooting at the Inland Regional Center on December 2, 2015 in San Bernardino, California.  Police continue to search for suspects in the shooting that left at least 14 people dead and another 17 injured.   (Photo by Sean M. Haffey/Getty Images)

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How the U.S. is responding to ISIS' phase 2

Now that ISIS has carried out multiple attacks beyond its borders, CNN's Evan Perez looks at the United States government's increased measures to protect the homeland.

How the U.S. is responding to ISIS' phase 2

Now that ISIS has carried out multiple attacks beyond its borders, CNN's Evan Perez looks at the United States government's increased measures to protect the homeland.