By Scott Whitlock | August 6, 2014 | 5:20 PM EDT

The author of a harsh expose on "nasty" Hillary Clinton appeared on MSNBC, Wednesday, and made his charges against the Democrat. The Cycle hosts grilled Ronald Kessler about his claim that Secret Service agents think Mrs. Clinton is "the worst." They also ignored his allegation that Bill Clinton is having an affair with a mistress known as "the energizer.

Promoting his book The First Family Detail, Kessler proclaimed, "Behind the scenes, [Hillary Clinton is] so nasty to her own Secret Service agents, who are there to protect her and even lay down their lives for her, that, she – being assigned to her detail is considered the worst assignment detail in the Secret Service." [See video below. MP3 audio here.] He added an assertion not often heard on liberal MSNBC: "That's something people should consider as well as track record when they elect a president." 

By Brad Wilmouth | November 12, 2007 | 4:48 AM EST

On Sunday's "NBC Nightly News," correspondent Pete Williams previewed details of a new book, The Terrorist Watch: Inside the Desperate Race to Stop the Next Attack, by Ronald Kessler, in which Kessler revealed information obtained by the an FBI agent who extensively intervi