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    State Dept. official: ISIS is 'uncharted territory'

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State Dept. official: ISIS is 'uncharted territory'

Assistant Secretary of State Brett McGurk told CNN's Jim Sciutto that combating ISIS is a "problem off the charts historically."

State Dept. official: ISIS is 'uncharted territory'

Assistant Secretary of State Brett McGurk told CNN's Jim Sciutto that combating ISIS is a "problem off the charts historically."