ISIS poised to exploit historic US Iraq exit, terror group 'actively waiting in the gaps,' expert warns

The Islamic State is quietly rebuilding as the United States prepares to complete its withdrawal from Iraq, raising fears the terror group could exploit a security vacuum, a regional security expert warned Sunday.

With U.S. forces leaving by Sept. 30 and as Baghdad tries to rein in Iran-backed militias, Iraq could also be entering its most dangerous period since ISIS seized Mosul in 2014, according to counterterrorism expert Dr. Omar Mohammed.

"ISIS is waiting actively in the gaps...