He helped engineer one of the greatest upsets in political history-the election of Donald J. Trump as president of the United States. Now, after a short and turbulent tenure in the White House, Steve Bannon is working on the outside to propel forward his populist agenda even when it puts him at odds with the Trump administration. Unafraid to speak the truth and unwilling to back down, Bannon has made headlines in recent months for slamming the Trump administration's approach to North Korea and China, backing controversial Senate candidate Roy Moore at all costs, and calling members of Trump's circle-including Trump's son Don Jr. and his son-in-law Jared Kushner-"treasonous" for meeting with Russians during the election.