President Trump, apparently still smarting at claims that his secretary of state called him a "moron", has suggested he would beat Rex Tillerson in an IQ test.
The president made the comments in an interview with Forbes, for a story published Tuesday.
"I think it's fake news, but if he did that, I guess we'll have to compare IQ tests", Mr Trump said.
The "world's oldest global IQ society" offered its services after the U.S. president responded to claims that Tillerson had called him a "f--ing moron".
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"American Mensa would be happy to hold a testing session for President Trump and Secretary Tillerson", said Mensa spokesman Charles Brown.
The organisation, which "provides a forum for intellectual exchange" among its members, requires an admissions test score which puts the applicant in the "upper two percent of the general population".
Trump tells reporters in the Oval Office that he and Tillerson "actually have a very good relationship".
"They're working hand in hand to move the president's agenda forward".
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"I'm generally not going to make a lot of the appointments that would normally be - because you don't need them", Trump said.
Trump added in the Forbes interview that Tillerson was "wasting his time" when Tillerson appeared to be reopening talks with North Korea.
If you're looking to throw down some more cash on US politics, Bovada is also offering betting lines on whether White House Chief of Staff John Kelly will stay in his job through 2017, which political party will win the 2020 election, and if Twitter will suspend President Trump's account this year.
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