Vice President Kamala Harris and President Joe Biden made their first joint campaign appearance post-convention in Pittsburgh on Labor Day, emphasizing their administration's strong support for unions. Harris opposed the sale of U.S. Steel to Japan's Nippon Steel, aligning with union concerns and Biden's stance that U.S. Steel should remain American-owned. They highlighted their past achievements for labor, including Harris's tie-breaking votes on the Butch Lewis Act and the Inflation Reduction Act. The rally, aimed at solidifying support from blue-collar voters in crucial swing states, featured Biden's emotional endorsement of Harris. Both Harris and Biden criticized former President Donald Trump, contrasting their forward-looking vision with what they described as Trump's outdated policies. The event marked the official start of their fall campaign season, with Harris urging early voting and continued labor support.