Tensions rise in Middle East after U.S. kills top Iran general

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Iran is vowing “harsh retaliation” against the U.S. after an airstrike in Baghdad killed Gen. Qassem Soleimani, a top commander of Iran’s Quds Force. NBC’s Richard Engel joins Ayman Mohyeldin and Yasmin Vossoughian to discuss the fallout and why it is difficult predicting how Iran may respond.