Fmr. McCain senior adviser discusses the importance of concession speeches

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Mark Salter, former senior adviser to John McCain, joins Andrea Mitchell to discuss writing McCain's concession speech in 2008 and the importance of these speeches. Salter says "Nobody can do anything about on January 20th, Joe Biden will be the 46th president of United States. Donald Trump can't prevent that. Donald Trump Jr. can't prevent that. Rudy Giuliani can't prevent that. Lindsey Graham can't prevent that. It's a fact."