For the first time, the mayor on Sunday responded to questions about federal investigators looking in to some of his campaign contributions. Our Courtney Gross was in the Bronx with the mayor and she filed this report.

A federal investigation into gifts and favors at One Police Plaza is seeping into City Hall.

"We have gotten no inquiry from any office," Mayor Bill de Blasio said Sunday. "No one associated with me has gotten any inquiry. I just cannot comment on something I have no specifics on."

For the first time, the mayor responded to questions about whether his campaign operation has become ensnared in the federal investigation examining if two Brooklyn businessman were handing out gifts to top brass at One Police Plaza in exchange for favors, like police escorts.

Four high-ranking NYPD officials have already been disciplined.

Sources familiar with this federal investigation say it also includes an examination of the mayor's campaign contributions. Details of how extensive this investigation is are unclear.

"Until we have something specific to respond to there is nothing to respond to," the mayor insisted. "Anything that comes forward, we always work with all of our colleagues in government. We have a long tradition of that but there is literally no evidence of anything happening as of this point."

One of the two men, Jona Rechnitz, and his wife gave nearly $10,000 to the mayor's 2013 campaign for City Hall. He also collected another $41,000 in donations for the mayor's bid and gave a whopping $50,000 to the mayor's nonprofit group, called The Campaign for One New York.

The mayor is refunding the 2013 campaign contribution, but that's it. He said on Sunday he would not give back the cash donated to his nonprofit , which was shut down suddenly last month.

"The Campaign For One New York has already spent all its money and is about to close," de Blasio said.

The mayor said he was not close with these two men but they did serve on his inauguration committee in 2013.

"I met them first around the time of the general election," de Blasio said. "I really hadn't seen them previously and I really haven't seen them in the last year or more."

He may not have seen them, but hizzoner could continue to hear about them for quite some time.