A member of New York City Mayor Bill de Blasio's inaugural committee who had two outstanding warrants was arrested Monday night after a traffic stop but was spared a night in jail in a case in which the mayor contacted a top police official, New York Police Department officials said.

Bishop Orlando Findlayter, the pastor of New Hope Christian Fellowship in Brooklyn, endorsed Mr. de Blasio in June, when the candidate was running behind in the polls. The bishop helped solidify Mr. de Blasio's support among African-Americans,...