 ABC News, I'm Michelle Franzen. As calls grow within the Democratic Party for President Biden to step aside as the nominee, the president is getting out to shore up support, visiting the headquarters of the largest labor union today in Washington, D.C., touting his record to create union jobs and expand American-made products. I've never been more optimistic about America's chances, not because of me, but because of what we're doing together. I really mean it. We're better positioned than any country in the world.