Read Mattis' remarkable letter to Trump informing him he's stepping down

Secretary of Defense James Mattis stepped down on Thursday, notifying President Trump in a letter that he believes someone should be in the role whose "views are better aligned with yours" when it comes to international alliances and partnerships. Mattis submitted the letter one day after Trump announced the Islamic State has been defeated and he wants to pull all U.S. troops from Syria, much to the delight of Russia. In his letter, Mattis said one "core belief" he's always held is "that our str...