IE 11 is not supported. For an optimal experience visit our site on another browser.

Trump's impact on the Secret Service was 'corrosive'

08:54

In her new best-selling book, 'Zero Fail,' Pulitzer Prize-winning Washington Post Reporter Carol Leonnig details the history of the Secret Service, Trump's impact on the agency, and so much more. Leonnig joins MSNBC's Brian Williams to discuss.