BREAKING: A source close to former CIA Director John Brennan confirms that he has received a subpoena in connection with the Florida grand jury investigation. Another source familiar with the matter says all the subpoenas in this round asked for documents related to the preparation of the 2016 intelligence assessment on Russian election interference. Brennan is a paid MSNBC contributor. For more context and news coverage of the most important stories of our day click here: https://www.msnbc.com/