US and Europe "need each other" says NATO chief at Davos

US President Donald Trump touched down in a tense Davos on Wednesday to give an "America First" speech that will push his world-shaking bid to seize control of Greenland. Trump's claims over the Danish territory have dominated the meeting in the Swiss ski resort, where Trump landed by helicopter. His arrival comes amid growing tensions with the US European allies, which NATO chief Mark Rutte is trying to deescalate.