There is NO federal "public integrity commission". Try again.
There is a Public Integrity Section of the Criminal Division of the U.S. Department of Justice.
"The Public Integrity Section oversees the federal effort to combat corruption through the prosecution of elected and appointed public officials at all levels of government."
http://www.usdoj.gov/criminal/pin.html
That is all fine. However, it is a different organization from what was speculated upon.