Watch: Bernie Sanders Talks 'Dark Money' with Journalist Who Literally Wrote the Book On It

Sen. Bernie Sanders on Thursday sat down with investigative journalist Jane Mayer to discuss the threat that secretive and undisclosed campaign financing—exemplified by the outsized influence of powerful billionaires like Charles and David Koch—continues to have on U.S. democracy and what should be done to push back.

Mayer—author of the 2016 best-seller —recently wrote a feature for The New Yorker in which she detailed the significant role the deep pockets, and bizarre far-right politics, of billionaire Robert Mercer played in President Donald Trump’s campaign run.

What Sanders argues is that too many people, whatever their primary focus or specific concerns might, are not “connecting the dots” on how insidious and pervasive the ‘dark money’ crisis has become.