Eric Adams throws his weight behind Andrew Cuomo while calling front-runner Zohran Mamdani a ‘snake oil salesman’ — sparking political shockwaves in City Hall.NH

Mayor Eric Adams on Thursday backed Andrew Cuomo’s campaign for City Hall, embracing his one-time bitter rival as “a brother” while slamming socialist front-runner Zohran Mamdani as a “snake oil salesman.” 

Hizzoner, who just three weeks ago ripped Cuomo as “a snake and a liar,” dapped up the former governor while delivering a full-throated endorsement of his independent bid for mayor — and issued a dire warning to Big Apple voters.

“This is the future of New York City at stake,” Adams told reporters while hitting the campaign trail with Cuomo as part of a concerted, last-minute effort to hamper Mamdani’s ascendance.

“If you don’t respect law and order and the police, you’re going to see crime go up. You see crime go up, you’re going to see people in this community suffer,” he said from NYCHA’s Johnson Houses in East Harlem.

Adams railed against Democratic nominee Mamdani, calling him a “snake oil salesman” whose anti-business policies will lead to an exodus of the wealthy, and an outsized amount of income taxes, from city coffers.

“You’re going to see more people leave New York. You’re going to see less revenue for New York,” he said, adding, “This will decide the future of New York City.”

The endorsement came the day after Adams and Cuomo palled around courtside at the New York Knicks’ season opener at Madison Square Garden – flashing smiles and thumbs up for cameras.

The unusual, but long-anticipated alliance between the two moderate Dems comes on the heels of Cuomo’s notable performance at the second and final mayoral debate Wednesday night — and as his backers hope to capitalize on any momentum.

Mamdani, meanwhile, is looking to put the final nail in Cuomo’s comeback bid by locking up the backing of establishment Democrat, House Minority Leader Hakeem Jeffries (D-Brooklyn), who has said he’ll decide whether to endorse the lefty lawmaker by the start of early voting Saturday.

Jeffries told the Rev. Al Sharpton that he wanted to meet with Mamdani before then.

“I do hope to talk to the Democratic nominee either late today or tomorrow, in advance of early voting,” he said Thursday during an appearance on Sharpton’s radio show “Keepin’ It Real.”

Start your day with all you need to know

Morning Report delivers the latest news, videos, photos and more.

Thanks for signing up!

Speculation had been rife that Adams, who dropped his likely doomed re-election bid last month, was warming to Cuomo, given their shared anti-Mamdani stance.

Longtime Adams adviser and Brooklyn powerbroker Frank Carone, who has been acting as a go-between for the two campaigns, had been slowly working to sway the mayor for months, arguing the only chance to stop Mamdani was to back Cuomo.

“What we want to do is just make sure New Yorkers know how important this election is and what’s at stake and get New Yorkers up and out to vote,” Cuomo said from the sidewalk on Madison Avenue, near East 102nd Street.

“New Yorkers reject this socialism, reject division,” he said. “If New Yorkers vote, I win.”

It marks a dramatic reversal from when Adams, who was then also running as an independent, ripped both Cuomo and Mamdani as “spoiled brats” born with silver spoons in their mouths.

“Andrew Cuomo is a snake and a liar,” Adams declared last month, adding the ex-governor “has had a career of pushing black candidates out of races.”

But Adams brushed off his past comments Thursday as simply a brotherly spat.

“Andrew’s a brother, and I had three of them, and brothers fight,” he said at the start of their joint press conference.

Insiders believe the addition of Adams, a prolific campaigner, could move the needle in Cuomo’s favor — despite the incumbent’s paltry poll numbers before he exited the campaign — and give the ex-gov a boost in black communities.

But the sources added Cuomo’s chances remain slim as he attempts to close the double-digit gap with Mamdani in just 12 days until the Nov. 4 election.

Jeffries, who has been dragging his feet in endorsing his party’s mayoral nominee, did praise Mamdani for his decision to ask Police Commissioner Jessica Tisch to stay on, if he’s elected.

“I think that probably will provide a lot of comfort to the people throughout the city of New York,” Jeffries told Bloomberg Thursday, adding Tisch has “done a great job.”

— Additional reporting by Emily Crane