 I give you my words of Biden. I would not be running again if I didn't believe with all my heart and soul I can do this job. He added that he knows how to tell the truth. The president warned that his political rival, Donald Trump, is a liar and a threat to the nation and democracy. The rally comes after Biden had an underwhelming debate performance, which sparked concern among some of his allies about his prospect for reelection. The Supreme Court will likely make a decision on former President Trump's immunity case on Monday.