City Council members sued Mayor Eric Adams over his alleged “corrupt bargain” to return ICE to Rikers Island – raging that it’d give President Trump free rein to deport innocent New Yorkers.

The incendiary, 29-page lawsuit filed Tuesday in Manhattan court seeks to halt the long-awaited, controversial Executive Order 50 allowing the feds to reopen the dormant ICE office.

Trump officials have made clear they plan to use Rikers as homebase for sweeping deportation operations, despite the order only permitting criminal probes, the lawsuit argues. 

“Executive Order 50 is a blank check,” the lawsuit states. “Its ostensible limitations are a farce written in erasable ink. Once ICE re-establishes a presence on Rikers Island, it will have no regard for the City’s laws.”

The lawsuit’s gambit to stop the order largely hinges on the mayor’s unusual decision to not sign the order himself, instead delegating it to First Deputy Mayor Randy Mastro.

Adams, the mayor, never formally gave his second-in-command the power to issue such an order, thus making it null and void, the suit contends. 

“The Mayor’s attempted delegation of authority to issue Executive Order 50 is invalid,” the suit states.

The executive order itself is the “poisoned fruit” of a shady deal that Adams made with Trump administration officials amid his corruption case, the lawsuit argues.

“Executive Order 50 is the product of a corrupt bargain between the Mayor and the federal government in which he agreed to issue an executive order to permit ICE to re-establish an office on Rikers Island in exchange for federal prosecutors dropping the corruption charges against him,” the lawsuit states.

Trump’s border czar Tom Homan not only confirmed such a deal, by colorfully telling Adams during a joint interview that he’d be “up his butt” if the mayor didn’t fulfill an “agreement,” the suit argued. 

The lawsuit also extensively quoted Homan broadly outlining his intentions to use the Rikers ICE office for wide deportations.

“I’ve made it clear, I want everybody,” he said on Fox News, according to the lawsuit. “If you’re an illegal alien, you get booked in Rikers Island, I don’t care if it’s for shoplifting, I want them. So, this is a start to deal with the worst of the worst in the beginning, but I made it clear that my plan on the whole of them, I want everybody. So, we’re gonna work toward that.”

Adams’ staff has repeatedly said the immigration agents will not conduct civil immigration enforcement and that no deal was made connected to the mayor’s prosecution, which was formally dropped last month.

Critics have sounded the alarm, however, claiming ICE would ignore people’s due process rights.

Speaker Adrienne Adams told reporters in City Hall Tuesday that the council’s lawyers have already filed for an injunction to halt the feds moving into the jail, raising concern about Trump’s administration overreaching.

“We have now seen them violate Constitutional rights. We have seen them downright kidnapping people from the streets,” she told reporters.

“Dare we think that this is going to be the end of it, having an ICE operation on Rikers Island? I don’t trust them. I don’t think that any New Yorker should.”

Mastro, in a dueling gaggle in City Hall, called the lawsuit premature and defended his power to issue the executive order as first deputy. 

He added that there would be “consequences” if ICE or any federal agent steps out of bounds in the jail — but stopped short of saying what those repercussions would be.  

“I can’t give you a specific date,” Mastro said when asked about the pending deal to operate in the jail between feds and the city. “It’s a ways off.”

The tensions spilled into a City Council hearing, where the mayor’s immigrant affairs Commissioner Manuel Castro was a no-show. 

In Castro’s absence, some council members and Public Advocate Jumaane Williams lambasted the mayor for failing to protect immigrants. 

“It just strikes me as appalling and unbelievable that the city agency charged with working with our immigrant communities is not here,” said Councilwoman Julie Menin, who chairs the committee on consumer and worker protection.

A City Hall spokesperson fired back.

“If you’re wondering why there is heightened anxiety in immigrant communities, look no further than these councilmembers and the public advocate, who are fanning the flames of fear with intentionally deceptive statements,” the spokesperson said in a statement.

City Hall officials also tried to rebut the lawsuit’s contention that Mastro “made no meaningful independent analysis” over allowing ICE to open offices on Rikers.

Sources told The Post that a draft for the executive order had been going around City Hall in the weeks before Mastro took the job. Details of that draft, however, were not known.

Deputy Mayor for Public Safety Kaz Daughtry was also on the island weeks ago scouting the jail for space, law enforcement sources said.