New York City Mayor Bill de Blasio launched a long-shot run for the Democratic presidential nomination in a campaign video released Thursday, touting his progressive beliefs and experience running the nation’s largest city.

Mr. de Blasio becomes the 23rd person to join the race for the Democratic nomination in the 2020 election. It is one of the largest fields of presidential candidates in the country’s history and includes former Vice President Joe Biden, Massachusetts Sen. Elizabeth Warren and South Bend, Ind., Mayor Pete Buttigieg.

In the video, Mr. de Blasio called President Trump a bully and vowed to run on a “working people first” platform.

“As president I will take on the wealthy, I will take on the big corporations,” he said in his campaign video. “I won’t rest until this government serves working people.”

In an early morning tweet, President Trump said Mr. De Blasio is “a JOKE, but if you like high taxes & crime, he’s your man. NYC HATES HIM!”