Former Republican New York Gov. George Pataki is endorsing Josh Eisen’s bid to upset two-term Democratic Sen. Kirsten Gillibrand later this year.

“New York deserves a senator who not only understands our state’s challenges but also has the courage and practical wisdom to address the complexities in Washington. Josh Eisen is that leader,” Pataki, 78, said in announcing his support for the GOP candidate.

“His extensive humanitarian work combined with his innovative thinking and legislative acumen make him uniquely qualified to bring about the change we desperately need.”

Eisen, a billionaire Westchester businessman and big-time Republican donor, entered the race back in December looking to capitalize on the red wave that washed over Long Island in the 2022 midterm elections.

Whoever wins the Republican nomination will face an uphill battle to unseat Gillibrand, 57, in the deep-blue Empire State.

Eisen’s task could get even tougher if another candidate enters the race from the right and splits the GOP vote.

Next week’s special House election between Democrat Tom Suozzi and Republican Mazi Pilip could be an early indicator of whether the GOP can capitalize on its New York momentum..

“I am confident that with Josh Eisen in the Senate, New York will have a representative who not only fights for them but also brings a refreshing, commonsense approach to governance,” added Pataki, who left office in 2007 and remains the most recent Republican to hold statewide office in New York.

Eisen, who unsuccessfully ran for Congress in 2020, said he was “humbled and honored” by the endorsement.

“I’ve traveled across our great state over the last few months and spoken to everyday New Yorkers about what matters most, and it’s the economy, jobs, cost of living, crime and a lack of immigration enforcement,” he said, adding, “Our leaders are completely disconnected from the realities that people face on a daily basis.”