US President Barack Obama speaks during the White House Summit on Countering Violent Extremism at the US State Department February 19, 2015 in Washington, DC. Obama reiterated his call for the world to stand up to violent extremism Thursday, saying jihadists peddle a the lie that there is a clash of civilizations. 'The notion that the West is at war with Islam is an ugly lie,' he told a three-day conference on combatting extremism. AFP PHOTO/BRENDAN SMIALOWSKI        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)