Foster Friess' contributions helped propel 2012 GOP presidential candidate Rick Santorum from single digits in the polls to virtually tying Mitt Romney.
The Natrona County Commission will interview the three candidates at its work session Tuesday and vote for one to fill the vacancy in the Assessor's Office.
Alabama GOP U.S. Senate candidate Roy Moore has denied the allegations, calling the Post report as "the very definition of fake news and intentional defamation."