Mayor Eric Adams of New York said on Saturday that former President Donald J. Trump should not be called a “fascist” or compared to Adolf Hitler, a rejection of Democrats’ closing focus in the final days of the 2024 campaign on the eve of Mr. Trump’s rally in Midtown Manhattan.

The embattled mayor, who has been indicted on federal bribery and corruption charges, made the comments at a time when Mr. Trump has been trying to make inroads with Black voters, and especially Black men, in his campaign against Vice President Kamala Harris, the Democratic nominee.

Ms. Harris has said in recent days that she agrees with Mr. Trump’s former White House chief of staff, Lt. Gen. John F. Kelly, that the former president meets the definition of a fascist. Mr. Kelly also described Mr. Trump as offering praise for Hitler.

Mr. Adams, mayor of America’s largest city and one of the country’s most prominent Black elected officials, was briefing reporters about security plans ahead of Mr. Trump’s rally Sunday at Madison Square Garden when he was asked if he believed the former president was a fascist.

“I have had those terms hurled at me by some political leaders in the city, using terms like Hitler and fascist,” said Mr. Adams, a former police officer. “My answer is no. I know what Hitler has done and I know what a fascist regime looks like.”

He added, “I think we could all dial down the temperature.”

Mr. Adams said that he had heard people say “that the former president should not be able to have a rally in Madison Square Garden.”

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