This week, Martha is joined by President Trump's former National Security Advisor, retired Three-Star General H.R. McMaster, author of new book, Battlegrounds: The Fight to Defend the Free World.

Martha and Gen. McMaster discuss where he believes the United States' biggest threats are around the world, the important shifts in foreign policy made under President Trump and his opinion on Robert O'Brien's performance as the current National Security Advisor.

Later, he explains why he believes the UAE-Bahrain-Israel deal is a tremendous achievement.

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