NEW : Obama to send in more troops reflects new phase in ISIS fight , Obama says . CBS : ` ` Now what we need is ground troops , Iraqi ground troops The decision to increase U.S. troop deployments to Iraq is n't a sign the U.S. strategy against ISIS is failing , but rather a signal the campaign is entering a new phase , President Barack Obama said in an interview broadcast Sunday on the CBS news program `` Face the Nation . '' , '' Obama tells CBS . NEW : Obama on America 's role in Iraq : ` ` Do n't mess with us . We 're not here to mess with you '' More death in Iraq as government bombs kill 21 in ISIS - controlled town .
NEW : Obama to send in more troops reflects new phase in ISIS fight , Obama says . CBS : ` ` Now what we need is ground troops , Iraqi ground troops , '' Obama tells CBS . NEW : Obama on America 's role in Iraq : ` ` Do n't mess with us . We 're not here to mess with you '' More death in Iraq as government bombs kill 21 in ISIS - controlled town .