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Fmr. top tax official: Trump lawyer threat on tax returns 'didn't really say anything'
George Yin, the former chief of staff of the Joint Committee on Taxation, tells Lawrence that it is "absolutely" the responsibility of Congress to obtain a president's tax returns to ensure that the letter of law is being followed by both the president and the institutions overseeing a president's tax returns. Lawrence O'Donnell is also joined by Ways and Means member Jimmy Gomez.