President Trump in a new interview offered to compare IQ tests with Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE after reports that the secretary of State had called him a "moron."

"I think it's fake news, but if he did that, I guess we'll have to compare IQ tests," Trump told Forbes in an interview published Tuesday.

"And I can tell you who is going to win."

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Tillerson called Trump a moron and considered leaving the administration, according to an NBC News report earlier this month.

In a press conference last week, Tillerson denied he ever considered leaving the administration.

He did not directly deny that he called Trump a moron, but the State Department later said the report wasn't true.

Trump tweeted last week that his secretary of State never threatened to resign, referred to the report as "fake news" and called for NBC News to apologize.

The relationship between Trump and Tillerson has reportedly grown more tense in recent months.

Trump said Saturday he sometimes wishes Tillerson would "be a little tougher."