Police officers patrol Trafalgar Square ahead of a planned demonstration against the NATO summit and U.S. President Donald Trump's visit, in London, Tuesday, December 3, 2019. Trump and his NATO counterparts were gathering in London Tuesday to mark the alliance's 70th birthday amid deep tensions as spats between leaders expose a lack of unity that risks undermining military organization's credibility. (Photo by Guy Bell/Rex Features/Shutterstock)
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