Within an hour of New York City Mayor Bill de Blasio joining the Democratic presidential race, he and President Donald Trump were already trading barbs.

During a Thursday morning appearance on 'Good Morning America', de Blasio borrowed one of Trump's favorite tactics by giving the president a disparaging nickname: "Con Don". He went on and said: "He's a con artist. I know his tricks I know his playbook."

In retaliation, Trump tweeted that de Blasio is "considered the worst mayor in the U.S." and added, "but if you like high taxes and crime, he's your man. NYC HATES HIM!" The mayor had announced his bid with a video released by his campaign early Thursday morning.

The spat between him and Trump came just days after Trump's younger son, Eric Trump, slammed de Blasio a day after the Democrat held a provocative news conference in Trump Towers. Eric took to Twitter and said that the NYC has "gone to sh** under the de Blasio's leadership.

Donald Trump Jr on Monday also joined in the criticism of the mayor after he accused their father of "evading taxes and stiffing workers for decades."

"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 tweeted on Monday.

"Most Mayors do all they can to support great businesses — here in NYC, businesses are attacked for headlines and "political points" and it is this very mentality that is causing people to leave our great city in droves," he added. "If [de Blasio] ever think[s] there is an initiative that would be great for New York, I would be happy to come to city hall and visit [him] anytime."

"But forcing a pop-up press conference in our lobby is simply childish. Maybe one of these days we can work together, an invitation which remains open to you anytime. I wish you and our great city the best."

De Blasio staged a news conference in the lobby of Trump Tower on Fifth Avenue in Manhattan on Monday. The mayor, while touting the city's anti-pollution law, said that he will announce this week that he's running for president. The NYC mayor chose a spot just steps away from where Trump announced his own presidential run in 2015. De Blasio, on Thursday, confirmed his presidential run against President Trump.

The Democrat said that he had come to the Trump Tower to warn the president that Trump Organizations could face a total of $2.1 million in annual fines by 2030 if they do not comply with a new law, which requires owners of skyscrapers in the region to cut down greenhouse gas emissions.

"President Trump, you're on notice. Your polluting buildings are part of the problem," he said.

 

De Blasio responded to Eric's tweets on Tuesday, writing: "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." 

Eric wrote a retort to the tweet, saying: "Spare me? First you have never created a job in your life. Second, our great city has gone to sh** under your leadership. Crime is up, the men and women of the NYPD detest you, homelessness is rampant, our streets are dirty and people are leaving our city in record numbers."

At this point, Donald Trump Jr joined the spat, writing: "Owned!!! It seems @NYCMayor has been a bit too busy getting whopping crowds of 4 & 5 people in the primary states to see the damage he’s inflicted on NYC. I look forward to his presidential run being even less successful than his time as mayor... if that’s even possible."

The NYC mayor then wrote another tweet writing that the Trump children were throwing a "temper tantrum."

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