New York City Mayor Bill de Blasio Bill de BlasioOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities New Year's Eve in Times Square to be largely virtual amid pandemic MORE (D) and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s son Eric Trump Eric Frederick TrumpJudge orders Eric Trump to comply with New York AG's subpoena before Election Day Eric Trump uses misleading clip to blast Biden for using teleprompter Melania Trump: Ginsburg's 'spirit will live on in all she has inspired' MORE got into a heated exchange this week over how new legislation aimed at combating climate change could impact the Trump Organization.

The two traded blows on Twitter after de Blasio warned on Monday that the Trump Organization could face fines of $2 million per year starting in 2030 if its buildings do not reduce their carbon emissions.

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The fines would come as part of the city's Green New Deal, an effort to reduce emissions by 30 percent by 2030. A citywide law, which is set to take effect on Friday, establishes tighter emissions standards for larger buildings.

"The fact that the Mayor of a major city would attack an iconic organization (which employs thousands of hardworking New York taxpayers) for his own political gain is an abuse of power, unethical and simply counterintuitive," Eric Trump, who serves as an executive vice president of the Trump Organization, wrote on Twitter.

(1/4) The fact that the Mayor of a major city would attack an iconic organization (which employs thousands of hardworking New York taxpayers) for his own political gain is an abuse of power, unethical and simply counterintuitive. @NYCMayor — Eric Trump (@EricTrump) May 13, 2019

De Blasio, who is considering launching a 2020 Democratic presidential bid, dismissed Trump's criticism on Twitter, saying that the city's climate initiative was one law the Trump family "won't get away with breaking."

"Spare me," the New York City mayor tweeted. "You and your dad have spent decades evading taxes and stiffing your workers. NYC’s Green New Deal is one law the Trumps won’t get away with breaking. Fix your buildings or pay the price."

Spare me. You and your dad have spent decades evading taxes and stiffing your workers.



NYC’s Green New Deal is one law the Trumps won’t get away with breaking.



Fix your buildings or pay the price. https://t.co/NZdqbWQF7T — Mayor Bill de Blasio (@NYCMayor) May 13, 2019

Trump later shot back that New York "has gone to shit" under de Blasio's leadership.