evidence: The message, allegedly from Hunter Biden to a Chinese business associate, showed him berating the associate in July 2017, when Joe Biden was a private citizen and former vice president. [...] In 2009, as Joe Biden was beginning his term as vice president under President Barack Obama, Hunter Biden co-founded Rosemont Seneca Partners, a Washington, DC-based investment fund with business in China. [...] Using testimony from whistleblowers and former government officials, Republican lawmakers have accused the Biden administration of obstructing attempts to find out more. They also argue Hunter’s business dealings have a direct effect on Biden’s policies towards China, a charge the White House has denied.