Tonight on The Last Word: Lawrence talks to Fmr. Massachusetts Gov. William Weld about his campaign and explains the history of what happens when an incumbent president gets a primary challenge. House Committees subpoena Deutsche Bank and others for  financial records. New reporting from NBC News that White House officials fear being exposed by the Mueller Report. And a Last Word from Lawrence on Trump’s lost lie about 9/11. Fmr. Gov. William Weld, Rep. Tom Malinowski, Rep. Raja Krishnamoorthi, Eugene Robinson and Jeffrey Engel all join Lawrence O’Donnell.

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