PHILADELPHIA — Sen. Al Franken returned to his comedy roots Monday, taking swipes at Donald Trump's business record in a Democratic National Convention address.

The Minnesota lawmaker and "Saturday Night Live" veteran said he knew Trump was a "right-wing megalomaniac" because he earned a doctorate in "megalomania studies" from Trump University, the program that has prompted fraud claims against Trump. Franken also joked that the school had a strong "bankruptcy program," referencing the Republican presidential nominee's use of the practices in the past.