A top State Department official hit Donald Trump Friday during a conference about genocide committed by the Islamic State, praising the country’s diversity and criticizing the Republican candidate’s pledge to build a border wall.

Deputy Secretary of State Tony Blinken acknowledged the difficulty of repairing the Iraqi society in the wake of genocide against Christians, Yezidis and Shia Muslims by the Islamic terrorist group, but he added that skepticism about “the value proposition of diversity and inclusion” has spread around the world.