The mayor of one of the largest cities in the U.S. announced in a Friday op-ed that he is leaving the Democratic Party and becoming a Republican. 

In a Wall Street Journal op-ed with the headline "America’s Cities Need Republicans, and I’m Becoming One," Dallas Mayor Eric Johnson explains that he is leaving the Democratic Party because "the future of America’s great urban centers depends on the willingness of the nation’s mayors to champion law and order and practice fiscal conservatism."

"Our cities desperately need the genuine commitment to these principles (as opposed to the inconsistent, poll-driven commitment of many Democrats) that has long been a defining characteristic of the GOP," Johnson wrote. 

"In other words, American cities need Republicans — and Republicans need American cities," he continued. "When my political hero Theodore Roosevelt was born, only 20% of Americans lived in urban areas. By the time he was elected president, that share had doubled to 40%. Today, it stands at 80%. As America’s cities go, so goes America."

DALLAS MAYOR ERIC JOHNSON SAYS 'RACISM WITHIN THE DEMOCRATIC PARTY' IS '800 LB GORILLA IN THE ROOM'

Dallas Mayor Eric Johnson

Dallas Mayor Eric Johnson speaks during the FIFA World Cup 2026 Host City Announcement at the AT&T Discovery District in Dallas on June 16, 2022. (Omar Vega/Getty Images)

Johnson has been a vocal supporter of police as other cities, including the Texas capitol of Austin, have moved to defund police departments in the wake of the George Floyd riots. 

In February, Johnson posted a Fox News Digital article on social media outlining how Austin police officers are retiring in droves due to low morale resulting from defunding and encouraged those officers to move to Dallas and work there.

AUSTIN CRIME VICTIM'S MOTHER RIPS CITY COUNCIL 'COWARDS' FOR DEFUNDING POLICE, TURNING CITIZENS INTO 'TARGETS'

First lady Jill Biden

First lady Jill Biden is greeted by Dallas County Judge Clay Jenkins, left, Dallas Mayor Eric Johnson and Rep. Eddie Bernice Johnson, D-Texas, as she arrives at Love Field Airport in Dallas on June 29, 2021. (CAROLYN KASTER/POOL/AFP via Getty Images)

"When you have a mayor who supports the police not only in his words but his actions, you see what happens to crime in your city," Austin Police Retired Officers Association Dennis Farris told Fox News Digital on Friday. 

"Mayor Johnson has led from the front and it showed when he was re-elected without one single challenger — that’s unheard of in a major U.S. city."

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Dallas skyline

Dallas skyline (iStock)

Dallas saw a significant decrease in crime after Johnson took office in 2019. Johnson told Fox News Digital in 2021 he attributed that success to three things — a strong police chief, having "a budget that reflects public safety being your city's top priority" and ensuring there’s "community buy-in" for crime reduction. 

Fox News Digital's Danielle Wallace contributed to this report.