Mayor Bill de Blasio refused Thursday to apologize to Gov. Andrew M. Cuomo for suggesting that Cuomo’s administration had orchestrated the leak of a state report that said de Blasio aides broke state campaign fundraising laws.

“That’s not going to happen,” de Blasio said of an apology.

Cuomo made his demand on Wednesday, the day after a state inspector general’s probe found that the leak of the report to the press came from a spokesman for the state Board of Elections.

The leaked State Board of Elections report said de Blasio and his political aides broke state campaign-finance laws in 2014 when coordinating fundraising efforts for Democratic State Senate candidates, as part of an unsuccessful effort to reclaim control of the chamber.

The state board unanimously voted to make a criminal referral to the Manhattan district attorney’s office, a source said. No one has been charged with a crime.

The governor’s office noted that the leaker is a Republican appointee, but de Blasio said, “the lines between Democrat and Republicans often blur in Albany.”

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Cuomo aides took to Twitter to condemn the mayor.

“Deflect is a lesser known river in Egypt as well,” tweeted Rich Azzopardi, a Cuomo spokesman.

“Remember when mayor baselessly accused a public servant of a leak, went so far as to reserve right to sue, was proven wrong & doubled down?” Cuomo’s chief of staff, Melissa DeRosa, wrote.

Cuomo and de Blasio have clashed repeatedly since de Blasio took office in 2014 over issues including prekindergarten funding.