Despite being dealt a blow in state court on Friday, Randy Mastro, the city’s first deputy mayor, remained confident about the city’s position on bringing immigration authorities back onto Rikers Island.

“At the end of the day, we will prevail,” he said.

Earlier, a judge extended a temporary restraining order against the city’s plan to allow ICE to reopen its office at the jail complex.

Mastro said the decision was a disappointment but that the plan is about public safety.

“We will continue to pursue our legal rights to protect New Yorkers from these violent, criminal, transnational gangs,” Mastro said following the court hearing.

The decision is the latest development in the legal battle between the City Council and the mayor.

The Council says the plan violates sanctuary city laws.

On Friday, the Council’s lawyer, Daniel Kornstein, argued for the extension. Kornstein said in court the plan was a “radical position” and the judge should maintain things as they are, citing ICE’s expulsion 11 years ago.

Kornstein also argued the plan is really “to expand and drum up deportations.”

Local lawmakers applauded the decision during a rally after.

“It validates our efforts to defend New York City from being made even more vulnerable to the Trump administration’s extreme agenda of unconstitutional activity,” Council Speaker Adrienne Adams said.

“The people of New York, mayor, are not pawns for your self righteous game. These people, New Yorkers, are people with lives, with families, who contribute to in every way to our city’s economy and culture,” Councilwoman Alexa Avilés, chair of the Immigration Committee, said.

But lawyers for the city denied the claims.

Lawyer Jim Catterson called the Council’s arguments “speculation” and a “political polemic masking as a petition.”

Mastro echoed those sentiments.

“We didn’t pack the courtroom to put political pressure. We didn’t bring a political diatribe masquerading as a lawsuit,” he said.

Mastro insisted Friday the plan is a top priority for the administration and himself, despite the timing coming after the mayor’s corruption charges were dropped and amid a growing relationship between Mayor Adams and Tom Homan.

“Whatever people thought in the past, whatever different administration’s thought in the past, whatever people thought on the other side of the hall in the past, it’s not acceptable today, it’s not acceptable to me,” Mastro said.

Mastro insisted the plan is about going after criminals and not focused on civil deportations.