Speaking in Las Vegas, Nevada, Democratic presidential candidate Bernie Sanders takes on “world renowned scientist“ Donald Trump’s theory that China is behind the “hoax“ of climate change. » Subscribe to NBC News: » Watch more NBC video: NBC News is a leading source of global news and information. Here you will find clips from NBC Nightly News, Meet The Press, and our original series Debunker, Flashback, Nerdwatch, and Show Me. Subscribe to our cha
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