Late-night hosts on Tuesday addressed Donald Trump’s feud with his secretary of state Rex Tillerson, which began weeks ago after Trump undermined Tillerson’s diplomatic effort to deter the North Korean nuclear threat.

“It has been a rough start to the school year for Donald Trump,” Stephen Colbert began. “His report card is definitely going to say has problems working and playing well with others. What can we do? The Oval office doesn’t have any corners. You can’t put him in a time out.

“It is open warfare between Donald Trump and the Republicans. It all started in an attempt to avoid open warfare with North Korea. You see, secretary of state and disappointed-father-tribute-head Rex Tillerson was in the middle of tense negotiations about North Korea and their nuclear program when Donald Trump tweeted that Tillerson was ‘wasting his time trying to negotiate with Little Rocket Man’.”

Colbert quipped: “Everybody knows there is no better way to defuse a tense nuclear standoff than with insult humor. Who can forget during the Cuban missile crisis when Kennedy tweeted: “Cueball @Khrushchev and Lil’ Beardy don’t have the balls. I double-dog dare you to push the button.”

Colbert then detailed Trump’s interview with Forbes magazine, in which he claimed not to be undermining Tillerson but rather “strengthening authority”.

“To thank him for all that strengthening of authority, Tillerson called him a fucking moron, allegedly,” Colbert explained. “But this morning he had an answer for that too.”

Trump told Forbes: “If he did that, I guess we’ll have to compare IQ tests. And I can tell you who’s going to win.”

“Me too! We have the results right here,” Colbert joked. “Tillerson scored a 120. It’s above average, not genius, but still pretty good. And we have Donald Trump’s results right here. It’s a drawing of a big truck that says MAGA.”

Jimmy Kimmel also weighed in on the Trump-Tillerson scuffle.

“President Trump continues to feud publicly with his own secretary of state,” Kimmel began. “Last week we learned that Rex Tillerson referred to Trump as a ‘fucking moron’ behind his back. Trump tweeted that the story was false, but Tillerson didn’t deny it, and clearly this is still eating at the president because this morning, in a new interview with Forbes magazine, they asked him about it.”

Kimmel then detailed Trump’s proposal that he and his secretary of state compare IQ tests.

“At this point I’m not sure Donald Trump could finish the maze on the back of a Denny’s kids’ menu,” Kimmel quipped. “I would pay $100 to watch Rex Tillerson and Donald Trump take IQ tests against each other. And I guarantee you the next day Kellyanne Conway would be on TV explaining that IQ tests are like golf, the lower the number the better the score.”

Kimmel then added that Tillerson is not Trump’s only Republican foe, as the president and Senator Bob Corker have been exchanging heated remarks for almost a week now. On Tuesday, Trump tweeted in response to Corker’s interview with the New York Times: “The Failing New York Times set Liddle’ Bob Corker up by recording his conversation. Was made to sound a fool, and that’s what I am dealing with!”

“If you don’t know how to spell little,” Kimmel replied, “don’t start an IQ battle with anybody.”

Finally, Seth Meyers of NBC briefly recapped some of the day’s news, including the continued allegations about Harvey Weinstein and sexual harassment and Trump’s public feud with Corker.

“The New Yorker today released audio of fired Hollywood movie producer Harvey Weinstein begging a model to come into his hotel room and watch him shower,” Meyers began. “And by the looks of him, I’m guessing that shower never happened. I mean, the rest of us need one.”

“White House press secretary Sarah Huckabee Sanders today said that President Trump’s comments that he had a higher IQ than Rex Tillerson was a joke and told reporters they should get a sense of humor,” he continued.

“They should get a sense of humor? You’re the one who always looks like she just found a joint in her son’s Bible. A CNN anchor said yesterday that Senator Bob Corker’s recent criticisms of President Trump was his way of planting seeds to call into question Trump’s fitness for office.

“You’re just now planting seeds? I think it’s harvest time.”