Donald Trump calls for The New York Times to fire economist Paul Krugman in the latest escalation of their longtime feud

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President Donald Trump called for the firing of longtime New York Times columnist Paul Krugman in a tweet on Sunday.

The tweet was the latest escalation in an ongoing war-of-words between the 45th president and the Nobel-prize winning economist.

Krugman responded in a tweet Sunday and said it was "kind of amazing how much rent-free space I seem to occupy in Trump's head."

Read more on Business Insider's homepage.

President Donald Trump called for the firing of New York Times columnist and Nobel-prize winning economist Paul Krugman in a tweet on Sunday in the latest escalation of the war-of-words between the two.

"Paul Krugman is a lightweight thinker who doesn't have a clue," the president tweeted Sunday morning. "Caused huge economic damage to his follower's pocketbooks. He, and others, should be fired by nytimes!"See the rest of the story at Business InsiderNOW WATCH: Extremists turned a frog meme into a hate symbol, but Hong Kong protesters revived it as an emblem of hopeSee Also:Fox News primetime is covering Trump's impeachment trial but with no audio of evidence from DemocratsPhotos show Republican senators passing the time at Trump's lengthy impeachment trial by playing with fidget spinnersDemocrats have a new tactic to blow up Trump's impeachment defense: using the president's own words against him

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