By Mike McDaniel Senator Chuck Grassley sent a letter to USA Hockey concerning the national governing body’s cooperation with an investigation. View the original article to see embedded media. The U.S. Center for SafeSport has reported USA Hockey to Congress for potential interference in investigation, according to a report from The Athletic. U.S. Senator Chuck Grassley sent a letter to USA Hockey regarding its cooperation with an investigation being conducted by the U.S. Center for SafeSport. It reminded USA Hockey of its legal obligations of complying with an investigation and protecting its…