How one of Trump's most controversial advisers rose to chief of staff – and what it means

President Donald Trump responded to this week's GOP drubbing by initially suggesting that he might soften his approach, expressing openness to collaborating with Democrats.

But after growing increasingly agitated by the midterm results, Trump abruptly changed course, replacing chief of staff Susie Wiles with longtime aide Stephen Miller amid encouragement from allies to ramp up the fight.