US attack 'inevitable' if N Korea persists
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North Korea nuclear test: Lindsey Graham warns of US attack

North Korea says it has successfully tested a hydrogen bomb, which can be loaded onto a missile.

Speaking the day before, US Republican Senator Lindsey Graham told BBC HARDtalk that an American military strike against North Korea was "inevitable" if something did not change.

Watch the full interview on BBC World News on Monday 4 September.

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