Reckless users and antiquated technology represent the federal government’s most critical cybersecurity vulnerabilities, House Oversight Chairman Rep. Jason Chaffetz said on Wednesday, a problem he said was exemplified by Hillary Clinton’s practice of buying Blackberry devices from eBay.

“We have a huge problem with personnel,” Chaffetz said at a forum in Washington, D.C. “I don’t want to get into this too much, but part of what was happening with the secretary of state was, she was acquiring technology that wasn’t even supported by Blackberry. You couldn’t buy it. She was actually buying this stuff off of eBay because somebody was selling their old machine. That’s what she liked, so she did. It creates this huge vulnerability. And it’s unnecessary.”