On Sunday's Last Week Tonight, John Oliver investigated what might be the biggest problem in America today: Donald Trump.

"We have mostly ignored Trump on this show, but he has now won three states, been endorsed by Chris Christie, and polls show him winning most Super Tuesday states, and that is a big deal," Oliver says, because Donald Trump is the Republican frontrunner for President, full stop.

"So at this point, Donald Trump is America's back mole," he continues. "It may have seemed harmless a year ago, but now that it's gotten frighteningly bigger, it is no longer wise to ignore it."

Jimmy Kimmel correctly notes that Donald Trump is a lot like The Producers

He then explains, point by point, why Donald Trump is a very bad presidential candidate. Mostly, Trump is a petty, unpredictable liar. And Trump isn't even his family name — it's Drumpf. An ancestor changed it from "Trump" to "Drumpf."

Unfortunately, it doesn't matter that Oliver has the facts on Donald Trump, because facts don't matter to Donald Trump and his supporters.

Check it out: