(FOXNEWS) — Hillary Clinton is facing renewed calls for FBI – as well as IRS and FTC – investigations even after she tried to close the book on her email scandal ahead of her party convention this week in Philadelphia, this time over questions about the tangled dealings of her family’s Clinton Foundation.

A group of 64 House Republicans, in a letter, has asked the FBI, the Internal Revenue Service and the Federal Trade Commission to examine the dealings of the foundation, alleging “criminal conduct” and describing it as a “pay to play” enterprise.

“I don’t know if it would be a super PAC or a for-profit entity,” Rep. Marsha Blackburn, R-Tenn., who circulated the letter, told FoxNews.com. “There sure is a lot of money going through there and it seems the contributions would touch on Bill Clinton, Hillary Clinton and the Clinton Foundation. It is a hub of some kind of activity and let’s leave it to the IRS, the FBI and the FTC to discern exactly what that is.”

Note: Read our discussion guidelines before commenting.