Latest "Trump administration chaos" stories
Mattis' speechwriter is promising an inside look at his relationship with Trump and his time leading the Penatgon.
The popular defense secretary will be a tough act to follow, especially given the circumstances surrounding his departure.
In the last year, the Department of Veterans Affairs has seen big successes and even bigger controversies.
Looks like Trump has changed his nickname for Defense Secretary Mattis, fueling speculation that the Pentagon's top leader is on his way out.
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