Top officials have long been warning about the threat posed by ISIS . He admitted there was some doubt that the forces would fend off ISIS 's incursions . ` President Obama said the U.S. ` ` underestimated '' the group 's rise in power . It was also hard to predict Syria 's military capabilities , the White House said .
Top officials have long been warning about the threat posed by ISIS . President Obama said the U.S. ` ` underestimated '' the group 's rise in power . It was also hard to predict Syria 's military capabilities , the White House said .