Eric loses his cool and gets into vicious Twitter spat with Mayor Bill de ...

A day after New York’s mayor held a provocative news conference in their father’s building, President Trump’s son, Eric, said the city has 'gone to s***' under his leadership - and got help from his older brother and former mayor Rudy Giuliani.

Eric and Donald Trump Jr slammed Bill de Blasio on Monday after the mayor accused them and their father, President Trump, 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 Trump 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 is this very mentality that is causing people to leave our great city in droves.

Eric Trump

New York City Mayor Bill de Blasio

Eric Trump (left) and New York Mayor Bill de Blasio (right) got into a heated Twitter feud on Monday. Trump was reacting to de Blasio's news conference in the lobby of Trump Tower in Manhattan on Monday

Trump slammed de Blasio for 'attacking an iconic organization for his own political gain'

Trump slammed de Blasio for 'attacking an iconic organization for his own political gain'

Trump said de Blasio was 'causing people to leave our great city in droves'

Trump said de Blasio was 'causing people to leave our great city in droves'

Eric, who is executive vice president of the Trump Organization, called de Blasio's news conference in the lobby of Trump Tower on Monday 'simply childish'

Eric, who is executive vice president of the Trump Organization, called de Blasio's news conference in the lobby of Trump Tower on Monday 'simply childish'

'Maybe one of these days we can work together, an invitation which remains open to you anytime,' Eric Trump tweeted at de Blasio

'Maybe one of these days we can work together, an invitation which remains open to you anytime,' Eric Trump tweeted at de Blasio

'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.'

Eric Trump was referring to the chaotic news conference that de Blasio staged in the lobby of Trump Tower on Fifth Avenue in Manhattan on Monday.

While touting a city anti-pollution law, the mayor was heckled by President Trump's supporters and said he will announce this week whether he's running for president.

De Blasio commandeered the Trump Tower lobby on Monday to threaten the Trump Organization with massive fines for flouting the city's global warming law, but protesters made the event a circus

De Blasio commandeered the Trump Tower lobby on Monday to threaten the Trump Organization with massive fines for flouting the city's global warming law, but protesters made the event a circus

Speaking at a podium steps from the spot where Trump announced his own run in 2015, the Democrat said he had come to warn the president that Trump Organization buildings could face a combined $2.1 million in annual fines by 2030 if they don't comply with a new law requiring skyscraper owners to cut greenhouse gas emissions.

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

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