In a candid interview, former Mayor Bill de Blasio strenuously argued that former Gov. Andrew M. Cuomo should not be elected to lead New York City: “He is a vindictive person,” Mr. de Blasio said.

Former New York governor Andrew Cuomo is eying a political comeback after being dogged by sexual assault claims, hoping to become mayor of New York City.

The top contenders in the Democratic primary for New York City mayor engaged in heated exchange Wednesday over experience.