New York City mayor and presidential candidate Bill de Blasio shouted a Spanish slogan associated with Cuba’s Communist revolution at a rally Thursday, drawing criticism in a city heavily influenced by exiles who fled Fidel Castro’s rule.

He later apologized on Twitter, saying he didn’t understand the history and significance of the phrase “Hasta la Victoria, siempre!”

Fresh from his appearance late Wednesday in a Democratic debate in which candidates pointedly spoke Spanish to appeal to Hispanic voters, de Blasio went to Miami International Airport to join cargo workers in the heavily Hispanic city. They are striking over what they call appalling working conditions.

De Blasio said he would stand by the workers “every step of the way.” He also shouted “Hasta la Victoria, siempre!” __ or “Until victory, always” __ a phrase most associated with revolutionary leader Che Guevara. It also became a rallying cry for Castro.

Florida state Sen. Annette Taddeo, a Democrat from Miami, delivered a sharp rebuke on Twitter in which she said she was “utterly disgusted.”

“This is completely unacceptable! How can anyone wanting to be the leader of the free world quote a murderous guerrilla – in Miami no less!” Taddeo said. “A community filled with his victims! #DeleteYourCampaign.”

U.S. Sen. Rick Scott, a Florida Republican, tweeted, “In case there was any doubt about the Democrats running for President embracing socialism, @BilldeBlasio is in Miami quoting…Che Guevara.”

De Blasio later tweeted that he “did not know the phrase I used in Miami today was associated with Che Guevara & I did not mean to offend anyone who heard it that way.”

“I certainly apologize for not understanding that history. I only meant it as a literal message to the striking airport workers that I believed they would be victorious in their strike.”

According to a 2013 profile by The New York Times , de Blasio studied Latin American politics at Columbia University. The newspaper reported he became supportive of Nicaragua’s leftist ruling Sandinista party in the 1980s, though later he became critical of the party’s crackdown on dissenters.

Evelyn Perez-Verdia, a Miami-area political strategist and commentator who advises politicians to connect with Hispanics, said de Blasio’s comment highlights the importance of having Latin America advisers.

“It is key to have individuals know what is being quoted in Spanish before they quote it. I don’t know where he got it from but he should fire someone who gave him that information incorrectly,” Perez-Verdia said. “I can’t believe an individual would quote Che Guevara.”

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