 White House correspondent Greg Cluxton says the president has been stepping up his drive aimed at convincing people that he does remain a viable candidate. It's been more than a week since the president's debate performance triggered widespread concern about his fitness for office. With Democrats divided on a path forward, Mr. Biden is doubling down and pushing ahead. The White House and campaign have announced a more robust travel schedule in the days ahead, including a trip to Battleground, Michigan, and a southwest swing during the Republican convention.