Trump sends six-page screed to Pelosi on the eve of historic vote

02:37

Trump blasted the impeachment inquiry in a six-page letter to Nancy Pelosi that he wrote for "the purpose of history." Lawrence O'Donnell breaks down how lines in "Trump's letter to future historians will be used by them as yet another piece of damning evidence about the mental state of the president of the United States the night before he was impeached."