Retired Lt. General H. R. McMaster on his new book, America's biggest threats and cyber warfare

Retired Lt. General H. R. McMaster on his new book, America's biggest threats and cyber warfare

CBS News

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Retired Lieutenant General H. R. McMaster served in the Army for 34 years and spent 13 months as President Trump's national security adviser. He joins "CBS This Morning" to talk about his new book, "Battlegrounds: The Fight to Defend the Free World."

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