Executives from solar panel manufacturer Solyndra, which received over a half a billion dollars in loan guarantees from the Obama administration before filing for bankruptcy earlier this month, will not answer questions from Congressional investigators as scheduled this Friday, citing their Fifth amendment rights, Reuters reports.

Originally, the company’s president and chief executive, Brian Harrison, and W.G. Stover, Jr., its chief financial officer, were scheduled to testify as part of last Wednesday’s hearing on questionable loans before the House Energy and Commerce’s oversight subcommittee.