evidence: Federal authorities with the U.S. attorney's office in Delaware, led by U.S. Attorney David Weiss, a Trump-era appointee, have been investigating Hunter Biden since 2018, before Joe Biden announced his 2020 presidential bid. [...] As developments in Hunter Biden's legal drama continue to ebb and flow, President Biden has maintained that he and his son never discussed his foreign business dealings. There is no indication that the federal investigation has involved the president in any way. [...] Later in July, the Oversight Committee interviewed Devin Archer, a former business associate of Hunter Biden's, who told lawmakers that Hunter Biden offered clients "the illusion of access" by promoting the "Biden brand" -- a tack that included Hunter Biden putting his father on speakerphone in the presence of clients for casual pleasantries -- but that Hunter Biden and his father never spoke about the younger Biden's business affairs, and he saw no evidence of wrongdoing by Joe Biden in connection with Hunter Biden's business dealings.