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Trump testifying in Congress would legitimize Democrats' impeachment efforts: Former US assistant attorney

FOX Business' David Asman and Kristina Partsinevelos, FoxNews.com columnist Liz Peek, Heritage Foundation economist Steve Moore, Capitalist Pig Hedge Fund founder Jonathan Hoenig and Fox News contributor and former assistant U.S. attorney Andy McCarthy discuss why the impeachment inquiry could be about rendering President Trump unelectable by 2020.