What do lawmakers hope to get out of Mueller’s testimony?

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Former Special Counsel Robert Mueller is set to appear before two Congressional committees this week. Stephanie Ruhle breaks down what lawmakers want to get out of his testimony. Weighing in: Bloomberg News National Political Reporter Sahil Kapur, Texas Tribune Washington Bureau Chief Abby Livingston, NBC’s Kristen Welker, and former Assistant U.S. Attorney for the Southern District of New York Mimi Rocah.