New York City Mayor Bill de Blasio announced Thursday morning via a YouTube video that he is jumping in to the 2020 presidential race, making him the 23rd Democratic candidate of note in a crowded field of hundreds.

In his first post-announcement interview, the mayor told ABC’s Good Morning America that will push issues of concern to working people and he touted his administration’s work with providing mental health care, paid sick leave and pre kindergarten for all.

“Working Americans deserve better and I know we can do it because I’ve done it” he said.

De Blasio, flanked by New York’s first lady, Chirlane McCray, suggested President Trump is a con artist who has pretended that he supports the needs of working Americans.

“I call him ‘Con Don,’ ” de Blasio said. “He’s trying to convince working Americans he’s on their side. It’s been a lie from day one.”

In response to questions about his unimpressive poll numbers, the mayor said he took 73% of the vote in his first election for New York City mayor and 67% of the vote in his reelection. “I think you’d agree that the poll that actually matters is the election,” he said. “It’s not where you start, it’s where you end.”

Today I am proud to announce my candidacy for president of the United States of America, because it's time to finally put working people first.https://t.co/p7LYipgAPg

Join me: https://t.co/sjKUWB2LwR #BdB2020

— Bill de Blasio (@BilldeBlasio) May 16, 2019

As de Blasio gave his interview, protesters from the New York City Housing Authority — the city’s troubled public housing agency — and from the Police Benevolent Association — the city’s police union — parked themselves outside the network’s studios in Times Square. News editorials and New Yorkers on social media have suggested de Blasio should work on troubles in his own city rather than focus on the White House.

After the morning interview, de Blasio was scheduled to deliver remarks at the Statue of Liberty Museum. Following that, he will head to the crucial primary state of Iowa, where he was scheduled to speak at a fundraising dinner hosted by the Woodbury County Democratic Party.

The announcement places de Blasio among a sea of Democrats clamoring for the chance to challenge President Trump. He will face an uphill battle with early polls generating low numbers for him.

The progressive Democrat who turned 58 last week is known for opposing Trump’s anti-immigration measures. De Blasio’s second mayoral term is set to conclude at the end of 2021.

The development ends months of speculation since the Mayor de Blasio first said he would not rule out a campaign.

“I’m not sure what lane de Blasio expects to occupy,” Patrick Murray, director of the Monmouth University Polling Institute, told Fortune. “He is better known than many other candidates who have been running since the beginning of the year, but most of them are generally well-liked by the Democratic electorate. De Blasio stands out mainly for the relatively high number of primary voters who say they don’t like him.”

“It’s not out of character for him to do something that kind of defies the pundits and is unexpected,” said Professor Joseph Viteritti, chair of the Urban Policy and Planning Department at Hunter College and author of The Pragmatist: Bill de Blasio’s Quest to Save the Soul of New York.

“That’s pretty much the way he’s run his career going back to the time he ran for … City Council but even School Board in Brooklyn,” Viteritti said in an interview with Fortune.

The professor added, “He obviously feels that what he’s done in New York has relevance for a national agenda for the Democratic party, which is still trying to define itself in terms of its priorities.”

Then, there’s the stiff competition. De Blasio will face off against former Vice President Joe Biden, a centrist who is emerging in polls as the clear Democratic frontrunner, along with U.S. Sen. Bernie Sanders of Vermont, U.S. Sen. Kamala Harris of California, and U.S. Sen. Elizabeth Warren of Massachusetts. He would become the second mayor to enter the race, after Pete Buttigieg of South Bend, Indiana.

There have been signs for awhile that de Blasio was headed in the direction of a White House run. In April, his communications director, Mike Casca, transferred over to work at the de Blasio’s Fairness Political Action Committee, launched last summer. Earlier this month, his intergovernmental affairs director, Jon Paul Lupo, took vacation time to work on a campaign, according to multiple reports.

In recent months, de Blasio has traveled to Iowa, South Carolina and Nevada-early primary states-and his Fairness PAC has raised more than $470,000, according to Federal Election Commission records.

De Blasio was born in Manhattan, raised in Cambridge, Mass., earned an undergraduate degree at New York University and a master’s degree in international and public affairs at Columbia University. He volunteered in Nicaragua, worked on the campaign of David Dinkins, New York’s first and only black mayor, and served as regional director of the Department of Housing and Urban Development under now Gov. Andrew Cuomo. In New York, he’s served on the school board, the city council and as the public advocate.