Pentagon spokesman : Higher ISIS estimate does n't change military approach . ISIS can `` muster between 20,000 and 31,500 fighters '' across Iraq , Syria , the CIA says . The White House says retired Gen. John Allen will lead international effort against ISIS . Iraqi Prime Minister : We are not going to allow this group of terrorists to threaten our country or its people.
Pentagon spokesman : Higher ISIS estimate does n't change military approach . ISIS can `` muster between 20,000 and 31,500 fighters '' across Iraq , Syria , the CIA says . The White House says retired Gen. John Allen will lead international effort against ISIS . Iraqi Prime Minister : French President says France will strike ISIS targets in Iraq .