Story highlights "He needs to come out and say, 'I didn't have the right information. Of course, she's qualified,' " Bill de Blasio said

"Hillary never said he was not qualified," De Blasio said

Washington (CNN) New York City Mayor Bill de Blasio said Thursday that Vermont Sen. Bernie Sanders claim that Hillary Clinton isn't qualified to be president "is not the right way to go."

"As his fellow progressive, this is not the right way to go. Hillary Clinton is eminently qualified to be president of the United States. By the way, Bernie Sanders is qualified to be president of the United States, too," De Blasio said on CNN's "At This Hour with Berman and Bolduan."

Sanders stood by his criticism that Clinton isn't "qualified" to be president Thursday during a news conference in Philadelphia.

"They're going to question my qualifications. Well, I'm going to question theirs," Sanders said, referencing comments Clinton made to MSNBC on Wednesday, saying Sanders hadn't "done his homework" before meeting with the New York Daily News for an interview

Read More