Hunter Biden's former best friend and business partner who is set to give Congress bombshell evidence against the Biden family is now 'in hiding' after receiving 'threats', a source close to him told DailyMail.com.

Devon Archer, 49, has been forced to flee both his Long Island and Brooklyn homes, he told friends – but still plans to testify to the House Oversight Committee on Monday.

Archer partnered with Hunter on multiple shady overseas deals, and was subpoenaed by the committee in June to testify.

A source close to Archer confirmed reports that he is set to testify about meetings he attended with his and Hunter's foreign business partners, where the First Son allegedly had Joe Biden on speakerphone.

The source added that Hunter's former Rosemont Seneca consultancy partner has been concerned for his and his family's safety in the days after his planned testimony was announced.

'There were reports that he was canceling his appearance. They're not true, he's not canceling. But he has gotten threats, and he's concerned about the threats,' the source said.

'His family has received threats. He doesn't know who from. But you don't have to be Dick Tracy to figure that out.'

There is no evidence that Hunter, Joe or their associates have made any threats to Archer or his family.

Another source close to Archer denied he was 'in hiding' but confirmed that he had received 'threats'.