"our wartime president has surrendered and left the battlefield." in his first news conference in months, the democrats' presumptive nominee saying the president, quote, failed us, and tonight, president trump is moving ahead with his fourth of july celebration at mt. rushmore, where no masks or social distancing will be required. here's abc's mary bruce. >> reporter: joe biden today accused president trump of abandoning the country he leads in the midst of this growing crisis. >> donald trump failed us. >> reporter: biden says trump is in retreat. >> it seems like our wartime president has surrendered, waved the white flag and left the battlefield. we can't continue half wearing masks and half rejecting science. we can't continue half with a plan and half just hoping for the best. >> reporter: the president has barely mentioned the new surge in cases, and he still refuses to wear a mask in public, even as his own vice president and top republicans are now urging americans to wear them. his allies on fox news joining in.