Vicente Fox quizzes Trump: Do you know the name of North Korea's leader?

Former Mexican President Vicente Fox quizzed President Donald TrumpDonald John TrumpSessions accepts 'Fox News Sunday' invitation to debate, Tuberville declines Priest among those police cleared from St. John's Church patio for Trump visit Trump criticizes CNN on split-screen audio of Rose Garden address, protesters clashing with police MORE on Tuesday on his political knowledge following Trump's offer to take an IQ test after reports that Secretary of State Rex TillersonRex Wayne TillersonDeadline for Kansas Senate race passes without Pompeo filing Democrats launch probe into Trump's firing of State Department watchdog, Pompeo The Memo: Fauci at odds with Trump on virus 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?"

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."

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."