 No, it's not Donald Trump. It's an increasingly defiant President Joe Biden, rejecting calls to step aside after a disastrous debate performance that has put his competence into question. And he's been embracing some of the tactics used by a man he calls a mortal threat to democracy, his rival, former President Donald Trump. The presumptive GOP nominee has weathered a seemingly never-ending list of controversies and has developed a well-worn playbook for confronting Democrats.