OSHKOSH, Wis. (AP) — Republican U.S. Sen. Ron Johnson says Joe Biden poses the greatest threat to President Donald Trump in Wisconsin. Johnson gave his assessment of the large Democratic presidential field at a news conference Saturday during the Wisconsin Republican Party convention. He calls Biden a “nice” and “likable guy” and compares him to a company’s sales manager. Johnson helped lead a review of the Wisconsin Republican Party to determine what went wrong in the 2018 election and to prepare for 2020.