NEW YORK (CBSNewYork) — New York City Mayor Bill de Blasio is focused on uniting delegates following a long and dramatic first day at the Democratic National Convention.

The convention began with more controversy over the release of hacked emails suggesting DNC staffers favored Hillary Clinton over Bernie Sanders in the Democratic primaries.

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Ending with riveting speeches from First Lady Michelle Obama and New Jersey Sen. Cory Booker, the first day also saw long and loud protests from Sanders supporters.

De Blasio, who is in Philadelphia for the event, said Sanders supporters are “rightfully upset” but that the DNC has taken “decisive action,” including issuing an apology to the Vermont senator and Debbie Wasserman Schultz announcing that she will resign as chair at the end of the convention.

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“That’s all going to sink in and it’s going to help people to feel better as we go forward in this convention,” de Blasio said in an interview with 1010 WINS on Tuesday.

De Blasio said he’s looking forward to doing everything he can to bring the whole party together to fight Republican Donald Trump.

“I think the delegates understand across the board that we have to defeat Donald Trump and that we need fundamental economic change in this country,” de Blasio said. “Trump is not the believable author of economic change. He’s been part of the problem. He’s a billionaire, he shipped jobs overseas, he’s done all the things that unfortunately have been classic of the one percent that brought us this very unfair and unequal economy.”

De Blasio is among the prominent Democrats who will be speaking at the convention. The list also includes New York Gov. Andrew Cuomo. Although the two may have had a rocky relationship, de Blasio said when it comes to the presidential race they’re united in their commitment to Clinton.

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“Even when there’s differences on some other issues all of us will be working shoulder to shoulder to elect Hillary Clinton,” de Blasio said.