Multiple 'Platte River Networks' employees, who wiped Hillary Clinton's private server and email archive with the software called BleachBit, plead their Fifth Amendment protections Tuesday at a House Oversight Committee hearing, and refused to testify about who told them to delete the information and when. <b>Related Viedeo</b>: <a href="http://www.realclearpolitics.com/video/2016/09/13/elijah_cummings_today_is_our_third_emergency_hearing_about_clintons_emails_in_four_business_days.html">Elijah Cummings: Today Is The Third "Emergency" Hearing About Clinton's Email Server In Four Business Days</a> Oversight committe chair Rep. Jason Chaffetz said this was a "serious matter." Hillary Clinton IT aide Bryan Pagliano refused to appear. "He should be here. … It is not optional," Chaffetz said. "His attendance is required here." "We decide what's relevant -- not the Department of Justice, not the FBI," Chaffetz said. "We are entitled to the full file." PRN employees Bill Thornton and Paul Combetta did show up to testify, along with Justin Cooper, a senior advisor to former President Bill Clinton who also helped with Clinton’s email server. "On advise of counsel I respectfully decline to answer and assert my Fifth Amendment privilege," they said repeatedly.