Former Mexican President Vicente Fox quizzed President Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Tuesday on his political knowledge following Trump's offer to take an IQ test after reports that Secretary of State 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 had called him a "moron."

"@realDonaldTrump don't take that IQ test," Fox tweeted. "Just answer this: You know the name of North Korea's leader, right? Is it -Un or is it -Il?"

.@realDonaldTrump don't take that IQ test. Just answer this: You know the name of North Korea's leader, right? Is it -Un or is it -Il? — Vicente Fox Quesada (@VicenteFoxQue) October 10, 2017

Trump and North Korea's current leader Kim Jong Un have sparred over the launch of North Korean missiles and nuclear tests, which escalated over the summer.

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Fox also took aim at the Trump administration's emergency response to the storm-ravaged Puerto Rico.

"@realDonaldTrump, another one: Puerto Ricans have been American citizens since 1917: true of false? Get it right and earn a toilet paper."

.@realDonaldTrump, another one: Puerto Ricans have been American citizens since 1917: true of false? Get it right and earn a toilet paper. — Vicente Fox Quesada (@VicenteFoxQue) October 10, 2017

Puerto Ricans have been U.S. citizens since the Jones-Shafroth Act in 1917.

Fox had previously tweeted a picture of toilet paper with images of Trump on each sheet, jabbing Trump for tossing rolls of paper towels into a crowd of Puerto Ricans on his visit to the territory to oversee the recovery efforts.

"Did you go to Puerto Rico to toss this paper?" Fox asked the president alongside an image of the toilet paper. "They don’t need more of your face nor your words, they need effective aid."