Joe and Hunter Biden, Donald Trump
Joe and Hunter Biden are photographed together on June 11, left, and Donald Trump is photographed at a campaign event on June 9.
  • Hunter Biden and Donald Trump's convictions may have damaged the US' global brand. 
  • Andrew Payne, a foreign policy expert, said they undermined the US' status as a democratic system. 
  • Biden's non-pardon of Hunter may benefit his campaign, but US credibility is hurt, said Payne. 

The US' reputation is in tatters, regardless of who takes the Oval Office in January, according to an expert.