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HAMBURG, GERMANY - JULY 07: In this photo provided by the German Government Press Office (BPA) Donald Trump, President of the USA (left), meets Vladimir Putin, President of Russia (right), at the opening of the G20 summit on July 7, 2017 in Hamburg, Germany. The G20 group of nations are meeting July 7-8 and major topics will include climate change and migration.  (Photo by Steffen Kugler /BPA via Getty Images)
HAMBURG, GERMANY - JULY 07: In this photo provided by the German Government Press Office (BPA) Donald Trump, President of the USA (left), meets Vladimir Putin, President of Russia (right), at the opening of the G20 summit on July 7, 2017 in Hamburg, Germany. The G20 group of nations are meeting July 7-8 and major topics will include climate change and migration.  (Photo by Steffen Kugler /BPA via Getty Images)

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Luke Harding speaks to Christiane Amanpour about what he says appears to be an emerging pattern of collusion between Russia, Donald Trump and his campaign.