Hillary Clinton turned to online retailer eBay to pick up older model Blackberry devices to be used with her private email server, a House committee chairman says.

'We have a huge problem with personnel,' Utah representative Jason Chaffetz said at an American Enterprise Institute forum in Washington Wednesday.

'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,' Chaffetz said, the Washington Examiner reported.

'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.'

Democratic presidential nominee Hillary Clinton bought Blackberry devices on eBay because she preferred the older model, representative Jason Chaffetz said

Clinton maintained a revolving arsenal of 13 mobile devices from 2009 through her time running the State Department, the FBI revealed in a report released Friday on the bureau's investigation of her.

Republican Donald Trump has been blasting Clinton on the campaign trail for her email practices.

'Who would do this? They even took a hammer to some of her 13 phones to cover up her tracks in obstruction of justice,' he charged in a national security speech in Philadelphia Wednesday.

Trump also hit her on Tuesday, though he mentioned a different device. ''The only people who use that many phones are usually involved in very, very, and I mean very shady activity,' Trump said.

'She was actually buying this stuff off of eBay because somebody was selling their old machine,' said representative Jason Chaffetz

Clinton cycled through 13 different devices, and preferred older model Blackberry products

Donald Trump has been pounding Clinton's 'shady' email practices on the campaign trail

'They used hammers to destroy phones so they couldn't be turned over later – and by the way, who uses 13 different iPhones in four years?' Trump asked.

The FBI notes also revealed that a Clinton aide used a hammer to destroy devices that were cycled out of commission.

'No one takes all the risks Hillary Clinton took unless they are trying to cover up massive crimes.'