Watch: Nato chief asked if there really is 'unity' in Nato

Nato Secretary General Mark Rutte insisted there is "unity" among the member nations, but the BBC's Frank Gardner questioned whether this is the case if Trump is still throwing "verbal grenades".

At the Nato conference in Turkey, world leaders have been discussing everything from Russia's war with Ukraine to the conflict in the Middle East, but looming large has been US President Donald Trump's continued criticism of the alliance.

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