As the Morning Joe discussion turned to Donald Trump’s announcement that he will run for President, Mike Barnicle says: “Can we stipulate, for the purposes of this conversation, that Donald Trump will never be President of the United States? We just showed his lethal danger to the Republican Party.” Listen here to the conversation between Joe Scarborough, Mika Brzezinski, Mike, and Jon Meacham, Executive Editor of Random House, about Trump’s likely impact on other GOP candidates and comparisons to Ross Perot. On MSNBC.