The appointment of Steve Bannon as Trump's chief strategist has sparked rage and protests this week. As executive chair of Breitbart News, Bannon ran a media outlet set on undermining establishment politicians and providing a platform for racism, sexism, and xenophobia.

But Bannon has also made an impact in a subtler, but perhaps more powerful, way. As head of the Government Accountability Institute, he has helped generate damning investigative research about major politicians--research that has spread through mainstream news outlets and shaped public opinion, particularly about Hillary Clinton.

Brooke talks with Bloomberg Businessweek senior national correspondent Joshua Green, who profiled Bannon last year, about how this two-pronged approach to political influence has primed Bannon for his new White House role.