Lieutenant General H.R. McMaster served in the US Army for 34 years and then as National Security Advisor to President Donald Trump.  He discusses what it was like to take over that job in the chaotic period following the firing of his predecessor Michael Flynn, how studying LBJ's mistakes during the War in Vietnam made him even more determined to provide the current Commander-in-Chief with straight-forward, unvarnished policy advice, and why he believes that some others in the White House might not h

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