For all the eye targeted in the course of the investigation into former President Donald J. Trump’s dealing with of categorised paperwork on Mar-a-Lago, his personal membership and residence in Florida, one other of Mr. Trump’s properties has performed a vital, if quieter, function within the case: his 520-acre golf membership in Bedminster, N.J.

Mar-a-Lago grabbed headlines final August after federal brokers descended on the compound and hauled away a trove of greater than 100 categorised paperwork, and the photographs of containers of presidential information piled there — together with in a toilet — helped clarify why prosecutors selected to indict him this month.

But Bedminster, the place Mr. Trump spends his summers, has turned out additionally to have been a spotlight of investigators, a flashpoint within the battle between prosecutors and Mr. Trump’s legal professionals, and the scene of a central episode in Mr. Trump’s indictment: a gathering by which he was recorded displaying off what he described as a “highly confidential” plan to assault Iran.

That audio recording, which was published on Monday by CNN and The New York Times, was the most recent piece of proof putting Bedminster on an nearly equal footing with Mar-a-Lago as a key location within the case being pursued in opposition to Mr. Trump by the particular counsel Jack Smith. Previously unreported particulars of the investigation present that prosecutors working for Mr. Smith have subpoenaed surveillance footage from Bedminster, very similar to they did from Mar-a-Lago, and fought a pitched battle with Mr. Trump’s legal professionals late final 12 months over how greatest to look the New Jersey property.

At one level within the early fall of final 12 months, investigators went as far as to debate executing a search warrant at Bedminster, based on two individuals briefed on the matter. Investigators have been involved that extra paperwork have been stashed on the membership and the one strategy to account for them was to look the property. But one of many individuals mentioned the Justice Department lacked possible trigger to acquire a warrant from a decide.

The discussions in regards to the warrant happened across the time that Jay Bratt, the highest counterintelligence official on the Justice Department, advised Mr. Trump’s authorized staff that prosecutors believed Mr. Trump nonetheless had extra categorised supplies in his possession.

Mr. Trump acquired Bedminster in 2002 and makes use of it as a seasonal escape from each New York and southern Florida. The property’s function as a summer time getaway made a cameo look within the indictment filed by Mr. Smith: Prosecutors mentioned that Mr. Trump’s co-defendant within the case, Walt Nauta, loaded containers from Mar-a-Lago onto a airplane “that flew Trump and his family north for the summer” on the identical day that Mr. Bratt confirmed up in Florida to gather the entire categorised paperwork remaining there.

As for the recording of Mr. Trump, it was made at Bedminster in July 2021 throughout a gathering attended by two of his aides — recognized by individuals with information of the matter as Margo Martin and Liz Harrington, who sat in on a few of Mr. Trump’s e-book interviews that summer time — in addition to by a writer and author engaged on a memoir for Mark Meadows, Mr. Trump’s last White House chief of workers.

On the recording, Mr. Trump will be heard rustling by way of papers and describing for his visitors a “secret” plan relating to Iran that he mentioned had been drawn up by Gen. Mark A. Milley, the chairman of the Joint Chiefs of Staff, and the Defense Department. Mr. Trump was describing the doc in an effort to rebut an account that General Milley feared having to maintain him from manufacturing a disaster with Iran within the interval after Mr. Trump misplaced his re-election bid in late 2020.

“This totally wins my case, you know,” Mr. Trump says, including that the papers he was apparently displaying have been “highly confidential” and “secret.”

One of the ladies heard talking on the recording was Ms. Harrington, three individuals with information of the matter mentioned. Ms. Harrington, considered one of Mr. Trump’s most aggressive defenders on Twitter, didn’t reply to questions on whether or not she is among the voices speaking on the recording as Mr. Trump seems to point out a bit of paper.

Ms. Harrington; Ms. Martin, who labored for Mr. Trump within the White House; and the opposite contributors within the assembly might be essential witnesses if Mr. Trump’s case goes to trial, since they’ll present firsthand descriptions of what he was displaying as he mentioned the Iran plan. A lawyer for Ms. Martin declined to remark.

People near Mr. Trump have instructed that the recording doesn’t specify whether or not Mr. Trump truly confirmed a confidential doc to anybody — and he told Bret Baier of Fox News last week that there was “no document.” Yet the indictment states plainly in its first few pages that he did show a doc, an assertion that seems to be backed up by his personal phrases as captured by the recording.

On Tuesday, in an interview with Fox News, maintained that there was nothing at odds with what he had advised Mr. Baier.

“I said it very clearly — I had a whole desk full of lots of papers, mostly newspaper articles, copies of magazines, copies of different plans, copies of stories, having to do with many, many subjects, and what was said was absolutely fine,” Mr. Trump mentioned. “I don’t do things wrong. I do things right. I’m a legitimate person.”

In an interview with Semafor and ABC News aboard his personal airplane in a while Tuesday, Mr. Trump once more insisted he had no categorised doc within the Bedminster assembly, saying his remarks have been merely “bravado,” and he provided a brand new rationalization for what the paperwork could have been and why he had talked about “plans” to Fox News.

“Did I use the word plans?” he mentioned. “What I’m referring to is magazines, newspapers, plans of buildings. I had plans of buildings. You know, building plans? I had plans of a golf course.”

Steven Cheung, a spokesman for Mr. Trump, mentioned the total context of the recording confirmed the previous president did “nothing wrong at all.”

Shortly after the assembly at Bedminster, individuals in Mr. Trump’s orbit have been conscious one thing uncommon had occurred, based on an individual with information of the occasions.

The indictment describes Mr. Trump assembly with the individuals engaged on the e-book and members of his workers, “none of whom possessed a security clearance.” It additionally says that Mr. Trump “showed and described a ‘plan of attack.’”

Mr. Meadows’s e-book comprises a reference to a doc that he claimed Mr. Trump mentioned General Milley had typed himself.

“The president recalls a four-page report typed up by Mark Milley himself,” Mr. Meadows’s e-book mentioned. “It contained the general’s own plan to attack Iran, deploying massive numbers of troops, something he urged President Trump to do more than once during his presidency. President Trump denied those requests every time.”

People near General Milley have denied that he urged attacking Iran.

Mr. Smith’s indictment means that prosecutors have obtained a considerable amount of surveillance digital camera footage from Mar-a-Lago, a few of it displaying Mr. Nauta, Mr. Trump’s co-defendant and private aide, transferring containers out and in of a storage room within the basement of the compound.

The motion of these containers — undertaken at Mr. Trump’s request, prosecutors say — lies on the coronary heart of a conspiracy cost accusing Mr. Trump and Mr. Nauta of obstructing the federal government’s efforts to reclaim the entire categorised supplies that Mr. Trump took with him from the White House.

But prosecutors additionally issued no less than one subpoena for surveillance digital camera footage from Bedminster as nicely, based on two individuals aware of the matter. The subpoena for that footage got here a while after the federal government’s request for the Mar-a-Lago footage, the individuals mentioned, although it stays unclear what the footage reveals or exactly why prosecutors wished to acquire it.

One factor, nonetheless, is for sure: Even after the F.B.I. searched Mar-a-Lago, Mr. Bratt and his staff remained involved that Mr. Trump was nonetheless holding on to categorised paperwork in violation of a subpoena for them that the federal government had issued three months earlier. So prosecutors contacted Mr. Trump’s representatives in September — one month after the Mar-a-Lago search — to offer the previous president one more likelihood to return any related materials, based on sealed court docket papers described to The Times.

At first, Mr. Trump’s legal professionals refused to conduct additional searches of his properties or present a sworn assertion certifying that the whole lot had been turned over, the court docket papers say, based on an individual briefed on their contents. In making their refusal, the legal professionals questioned the scope and validity of the preliminary subpoena, and argued that Mr. Trump’s presidential workplace may incriminate itself if extra categorised paperwork have been found and returned.

The authorities responded by submitting a movement to compel compliance with the unique subpoena, and a listening to was scheduled for late October in entrance of Judge Beryl A. Howell, who was then the chief decide in Federal District Court in Washington.

One of Mr. Trump’s former legal professionals, Timothy Parlatore, has since instructed that Boris Epshteyn, one other lawyer near Mr. Trump, “attempted to interfere” with searches commissioned by the Trump authorized staff round that point. Mr. Parlatore made the remarks about Mr. Epshteyn in a CNN interview final month by which he cited his variations with Mr. Epshteyn as a key motive that he had resigned from representing Mr. Trump. (He later mentioned Mr. Epshteyn didn’t commit any “wrongdoing” and known as it a disagreement.)

Minutes earlier than the listening to in entrance of Judge Howell, Mr. Parlatore alerted her and the federal government {that a} staff of pros with navy coaching had searched Bedminster for categorised supplies simply days earlier. They have been supervised by one other considered one of Mr. Trump’s legal professionals on the time, James Trusty.

But the Justice Department, based on court docket papers described by individuals aware of them, was not impressed. Prosecutors complained that the search had been restricted to sure areas of Bedminster and was not accompanied by a sworn assertion detailing which components of the membership had been examined.

In the tip, Judge Howell determined in favor of the federal government, ordering Mr. Trump’s legal professionals to supply a sworn assertion about which components of Bedminster had been searched. She additionally advised the legal professionals to make a “custodian of records” for Mr. Trump’s presidential workplace accessible to testify in regards to the search in entrance of a grand jury.

Ben Protess, William Okay. Rashbaum and Adam Goldman contributed reporting.