Vice President Kamala Harris and former President Donald Trump both made their cases on Labor Day to support unions and American jobs.In Pennsylvania, Harris appeared alongside President Joe Biden and union workers, voicing opposition to U.S. Steel being sold to a Japanese company. Both agreed the deal would hurt American workers and made clear a policy position for Harris' election campaign."We are fighting to build an economy that works for all working people. That has always been the vision of the labor movement and that is the vision of our campaign," Harris said.Trump, who also opposes the steel deal, was not on the campaign trail but made claims on social media instead, saying the weak and failed leadership of the current administration has led to high costs. As president, he said he would continue building on fair and free trade deals and programs to help the American worker. "When I return to the White House, we will continue upon our Successes by creating an Environment that ensures ALL Workers, and Businesses, have the opportunity to prosper and achieve their American Dream," he wrote.Harris and Trump will go head-to-head in their first and possibly only debate next week. A Trump campaign official said the event would look similar to what happened in June, with no audience and live microphones when candidates aren't talking.Host network ABC News said the candidates will not make opening statements and will not be allowed to bring notes during the 90-minute debate.Harris plans to make her next campaign stop in New Hampshire on Tuesday. While his surrogates campaign this week, Trump's will rally in Wisconsin this weekend.