Vice President Kamala Harris continued scorching her opponent on the debate stage, giving former President Donald Trump a memo: “You’re not running against Joe Biden, you’re running against me.” Speaking Tuesday night in Philadelphia, Harris was asked to follow up on Trump’s comments in which he suggested the United States is on the precipice of World War III and demanded to know, “Where is our president?!” “We don’t even know if he’s our president!” an emphatic Trump said. “They threw him out of the campaign like a dog. We don’t even know, is he our president? But we have a president that doe…