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It said the city for too long "has been a hostile place for Christians and Jews."
And it added that "Hammoud has taken this hostility to the next level, openly conveying the message that Christians and Jews are not welcome in the city and are, indeed, second-class citizens."
In its statement Saturday, the city responded by saying it "has a longstanding commitment to serving all residents fairly and equitably, regardless of faith or background.
"Our city has increasingly come under attack precisely because of its welcoming nature and the diversity of the people who proudly call Dearborn home," the statement said.
It added: "That will not change who we are. Dearborn will continue to uphold the rights and dignity of every resident and remain a city where everyone is treated with fairness, respect, and equal protection under the law."