Nobel Prize-winning economist turned political pundit Paul Krugman hit back after President Donald Trump attacked him by name on his Truth Social platform over the weekend.

"Paul Krugman of the New York Times has been predicting Doom and Gloom ever since my great election success in 2016. In other words, he has been wrong for YEARS, as ALL markets have been hitting new HIGHS, and are now higher than ever before. People stayed out of the 'BEST MARKET IN HISTOY [sic]' because of this Trump Deranged BUM. Sue them!" wrote Trump, apparently unaware that Krugman no longer writes for The Times.

"Ever since that latest weak jobs report, Trump has been frantically trying to convince the American public that the economy is doing great," Krugman wrote. "He is failing, and predictably so. Experience shows that trying to talk up the economy when people don’t perceive it as good never works, even if the data are favorable. It’s even less likely to work when the data actually aren’t good, and calling people who point out economic weakness BUMs isn’t likely to help."

Trump is trying to do the opposite with his federal takeover of Washington, D.C., Krugman noted, claiming the city is riddled with crime and lawlessness even though crime has dropped precipitously over the last few years.

And it's incumbent on those who report these facts to cut through the noise and call it like it is, he added.

"Anyone who either lives there are looks at crime data knows that this is malicious nonsense. But we can’t take it for granted that the rest of the country will understand that that he’s lying," Krugman wrote. "And if I may say, it’s the responsibility of the news media to make that clear. Don’t say 'Trump makes contentious claims about DC crime.' Don’t say that there’s 'dispute over DC crime data.' Just say that he’s lying."