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) on Monday slammed 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 for criticizing London Mayor Sadiq Khan.

"#ConDon takes another shot at me. But I’m a total @SadiqKhan stan, so consider any comparison a compliment," the 2020 White House hopeful tweeted. The term "stan" comes from an Eminem song and refers to someone who supports an individual almost regardless of their actions.

"Plus the Mayor is a much better British doppelgänger than Brexit Bojo," de Blasio added.

#ConDon takes another shot at me. But I’m a total @SadiqKhan stan, so consider any comparison a compliment. Plus the Mayor is a much better British doppelgänger than Brexit Bojo.... https://t.co/HkSbR8Hzml — Bill de Blasio (@BilldeBlasio) June 3, 2019

De Blasio then attached a side-by-side photo of Trump and conservative politician Boris Johnson.

Trump mocked Khan on Sunday before his state visit to the United Kingdom as the “twin of de Blasio, except shorter.”

De Blasio also tweeted a joke about that comparison, saying that Trump "is Putin’s twin, only his presidency will be shorter."

Trump re-upped his criticism of Khan on Monday, calling him a "stone cold loser."

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Khan responded that the president represents a “growing far-right threat around the globe.”

"This is much more serious than childish insults which should be beneath the President of the United States," Khan’s office said in a statement.

De Blasio last month jumped into the crowded field of Democratic contenders for the 2020 presidential election.

The New York City mayor barely shows up in most polls and faces opposition in his home city to his presidential run.