A former senior investigator with the State Department’s criminal investigative unit has turned whistleblower and alleged to both the media and Congress that senior staff within State Department covered up investigations into appalling behavior committed by members of Hillary Clinton’s security staff and our ambassador to Belgium. One of those alleged to have interfered was Cheryl Mills, Hillary’s chief of staff.

The case in which Clinton enforcer Mills allegedly intervened centered upon Brett McGurk, Obama’s nominee to be US ambassador to Iraq.

McGurk’s expected nomination fell apart after a computer hack exposed his racy e-mails and an extramarital affair with Wall Street Journal reporter Gina Chon.

According to the memo, the SID “never interviewed McGurk, allegedly because Cheryl Mills from the Secretary’s office interceded.”

“Without that interview, SID has been unable to close the case,” the memo concludes.

Mills is a longtime associate of the Clintons, going back to 1992, and was also at the center of the first scandal to hit Hillary’s State Department: Benghazi. Gregory Hicks, the former Deputy Chief of Mission in Libya, testified before Congress that Mills instructed him not to cooperate with the Congressional investigation into the September 11 terror attacks.

Mills isn’t the only high-ranking official being named. Patrick Kennedy, the Undersecretary of State for Management, is directly accused of killing an investigation into our Ambassador to Belgium, Howard Gutman, who is accused of slipping away from his security detail to solicit sex from minor children.

Gutman was a big Democratic donor before taking the post, having raised $500,000 for President Obama’s 2008 campaign and helping finance his inaugural.

* At least seven agents in Clinton’s security detail hired prostitutes while traveling with her in various countries, including Russia and Colombia.

Investigators called the use of prostitutes by Clinton’s security agents “endemic.”

Amid all the other scandals, this latest mess is still picking up some traction in the mainstream media. Here is Chuck Todd’s “Today Show” report:

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Todd makes a good point that the crimes alleged here are just as bad as the cover-up.

Follow John Nolte on Twitter @NolteNC