City Council Speaker Melissa Mark-Viverito says Donald Trump's immigration plans and proposed ban on Muslims would devastate the city economically. She backed up her claims with an official City Council study — conducted by economists on the public payroll. Our Grace Rauh has the story.

If Donald Trump is elected president - and enacts the immigration policies he's promoting on the campaign trail - it would have a serious impact on the city's bottom line. That was the message City Council Speaker Melissa Mark-Viverito delivered to a business-friendly audience at the Association for a Better New York.

"Donald Trump's racist fear-mongering proposals would hurt New York's economy and they prove beyond a doubt that he is unqualified to be president," the Council Speaker said.

She says if Trump's plan to deport immigrants living here illegally were enacted, the city and state would lose nearly $800 million dollars in tax revenue. And she says more than 340,000 jobs would disappear.

"The Republican primary was a race to see who could dehumanize immigrants the most," Viverito said. "A race to find the candidate most eager to strip immigrants of their dignity and the undisputed winner of that contest is Donald Trump."

The Speaker is a vocal supporter of Hillary Clinton's and a key surrogate on the campaign trail. She has also been a forceful critic of Clinton's Republican rival. But her speech Wednesday was different than the anti-Trump messages she's delivered on the steps of City Hall and outside Trump Tower. This time, her words were backed up by an economic analysis conducted by City Council economists.

"It's not partisan at all," Viverito said. "We did not outsource any of this. It was through our economists at the City Council. The council does this kind of analysis all the time."

The Speaker said she did not think a similar analysis on Clinton's policies was necessary. She says she did not coordinate her speech with the Clinton campaign.

The Trump campaign did not respond to a request for comment.

After the speech the speaker was scheduled to go to Philadelphia to campaign for Clinton.