Former Vice President Mike Pence speaks to reporters at the Iowa State FairChip Somodevilla/Getty Images Mike Pence knocked Joe and Hunter Biden over news of a special counsel's investigation. Pence said when he was vice president, "my son was flying an F-35 for the Marine Corps." Hunter Biden was conducting business with foreign companies and struggled with substance abuse during Biden's vice presidency. Former Vice President Mike Pence on Friday took a shot at President Joe Biden over his son Hunter's conduct while Biden was serving as vice president."To be honest with you, I can't relate to what his son was doing while he was vice president," Pence told reporters while campaigning at the Iowa State Fair.