Duke professor on President Trump's foreign policy approach

On this week's episode of Tying it Together, Dr. Bruce Jentleson joins host Tim Boyum to explain the story behind all the foreign policy battles garnering the attention of President Trump — from Iran, Venezuela, Ukraine, to Greenland. Jentleson is a professor at the Sanford School of Public Policy at Duke University. He's a former senior adviser at the State Department under the Obama and Clinton…