Michael Bloomberg, former mayor of New York and billionaire candidate for presidency, apologized for supporting the city's Stop and Frisk policy.
Speaking in an Afro-American church in Brooklyn, New York, Bloomberg said politics was a mistake.
He believed that Stop-and-Frisk had saved lives, but did not accept good intentions well enough.
"I can not change history," he told the community at the Christian Cultural Center. "However, I want you to know today that I realized then that I was wrong, and I'm sorry, but I also want you to know that I'm more committed than ever to ending the force of arms. "
Mr. Bloomberg, who was the Republican mayor of the city from 2002 to 201
"Trust between police and communities, trust between you and me," he said. "And the erosion of trust has deeply troubled me and it still bothers me and I want to earn it again."
Although he has not officially announced his candidacy, Mr Bloomberg has announced that he can join the Democratic race for presidency ahead of next year's election.
Since the end of his term as mayor, Mr. Bloomberg has repeatedly defended the Stop-and-Frisk policy – even in January this year.