Grassley: Joe Biden ‘Has Explaining to Do’ Over Hunter Biden Probe Democratic presidential candidate Joe Biden has “a lot of explaining to do” about his son and brother’s business dealings, which were potentially criminal in nature, Sen. Chuck Grassley (R-Iowa) said on Monday, just hours before Biden for the second time this month dodged a question about the federal probe into his son’s affairs. Grassley said the report that he and Senate Governmental Affairs Chairman Ron Johnson (R-Wis.) recently published showed that Hunter Biden and his associates and family members were connected to Chinese nationals and Chinese companies linked to the Chinese Communist Party.