[Above: SNL parodies a presidential debate, October 2020. -- eds] Donald Trump is a serial liar unrivaled in modern politics. He often goes on weird tangents that have nothing to do with a question, either because he can't retain any knowledge related to any policy or legislation or because he lacks enough attention span to do so. Since he rode down the escalator in 2015, Trump has been implementing Joseph Goebbels's strategy: when you tell a lie long enough, people will believe it.