Donald Trump’s nominee to head the Pentagon, retired Marine General James Mattis, is scheduled to testify at a Senate confirmation hearing today, but his nomination is in doubt after House Democrats threatened a revolt. Mattis retired from the military in 2013, meaning he needs Congress to waive rules requiring defense secretaries to be civilians for seven or more years after leaving the military. The top Democrat on the House Armed Services Committee, Rep. Adam Smith of Washington, said he will urge all House Democrats to vote no on the waiver. In the Senate, New York Democrat Kirsten Gillibrand said, “Civilian control of our military is a fundamental principle of American democracy, and I will not vote for an exception to this rule.” We’ll have more on James Mattis, including allegations he committed war crimes in Iraq, later in the broadcast, as we speak with Aaron Glantz of The Center for Investigative Reporting.