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Why Mattis’ resignation made history, created ‘crisis’ conditions

James Mattis is the first secretary of Defense to ever resign in protest, declaring that the sitting president is not acting in the nation's interests.

Image: Trump Hosts Egyptian President Abdel Fattah Al Sisi At The White House
WASHINGTON, DC – APRIL 03: (AFP OUT) US President Donald Trump flanked by Secretary of State Rex Tillerson (L) and Defense Secretary Jim Mattis (R) looks…Getty Images

Steve Benen is a producer for "The Rachel Maddow Show," the editor of MaddowBlog and an MS NOW political contributor. He's also the bestselling author of "Ministry of Truth: Democracy, Reality, and the Republicans' War on the Recent Past."