President Donald Trump is a bit confused about the causes of the American Civil War.

In an interview with Sirius XM’s Salena Zito, which aired on Monday morning, Trump compared himself to President Andrew Jackson — a populist known to history for his championing of the interests of white men and his role in ethnically cleansing the southeastern United States of American Indians. Trump expressed admiration for Jackson, which he has done before, but then went out into left field.

“People don't ask that question, but why was there the Civil War?” the president asked. “Why could that one not have been worked out?"

Here’s the full exchange:

Here's Trump's full answer on "swashbuckler" Andrew Jackson and the Civil War: "Why could that one not have been worked out?" pic.twitter.com/Zb8OQaDqyq — Edward-Isaac Dovere (@IsaacDovere) May 1, 2017

Four things to say about this: