He's gonna lose big on this one

And he'll no doubt appeal to the Supreme Court. I don't think they'll hear it.

Federal prosecutors have evidence Donald Trump was put on notice that he could not retain any classified documents after he was subpoenaed for their return last year, as they examine whether the subsequent failure to fully comply with the subpoena was a deliberate act of obstruction by the former president.

The previously unreported warning conveyed to Trump by his lawyer Evan Corcoran could be significant in the criminal investigation surrounding Trump’s handling of classified materials given it shows he knew about his subpoena obligations.

[...]

The federal investigation led by special counsel Jack Smith has recently focused on why the subpoena was not compiled with, notably whether Trump arranged for boxes of classified documents to be moved out of the storage room so he could illegally retain them.

In particular, prosecutors have fixated on Trump’s valet Walt Nauta, after he told the justice department that Trump told him to move boxes out of the storage room before and after the subpoena. The activity was captured on subpoenaed surveillance footage, though there were gaps in the tapes.

  The Guardian

Who is Trump's Rose Mary Woods?

To resolve the issue about the gaps in the surveillance footage, the special counsel most recently subpoenaed Matthew Calamari Sr, the Trump Organization’s security chief who became its chief operating officer, and his son Matthew Calamari Jr, the director of corporate security.

Both Calamaris testified to the grand jury earlier this month, the Guardian previously reported, and were questioned in part on a text message that Nauta had sent asking Calamari Sr to call him back about the justice department’s request for the tapes last year.

[...]

The warning was one of several key moments that Corcoran preserved in roughly 50 pages of contemporaneous notes.

One of Trump's wiser attorneys.

The notes revealed how Trump and Nauta had unusually detailed knowledge of the botched subpoena response, including where Corcoran intended to search and not search for classified documents at Mar-a-Lago, as well as when Corcoran was actually doing his search.

[...]

The justice department interviewed Nauta several times last year until prosecutors grew concerned that he failed to provide them with a complete and accurate account of his role in moving boxes that contained classified documents, according to two people familiar with the situation.

To force his cooperation, prosecutors threatened to charge him with lying to the FBI after he gave differing accounts over several interviews. But that incensed Nauta’s lawyer, who told the justice department his client would not talk again unless he was charged or offered an immunity deal.

After losing Nauta, investigators have turned to other witnesses who could shed light on his role.

[...]

Although ordinarily off limits to prosecutors, the notes ended up before the grand jury in Washington hearing evidence in the case after a US appeals court allowed attorney-client privilege to be pierced because judges believed Trump might have used Corcoran’s legal advice in furtherance of a crime.

There is no executive privilege for committing crimes.

The notes also suggested to prosecutors that there were times when the storage room might have been left unattended while the search for classified documents was ongoing, one of the people said, such as when Corcoran needed to take a break and walked out to the pool area nearby.

I'm going out for 20 minutes, and the door's not locked. Hint, hint.

In addition to his exchange with Trump, Corcoran described Trump’s facial expressions and reactions whenever they discussed the subpoena. The unusually detailed nature of his notes is said to have irritated Trump, who only learned about them after the notes themselves were subpoenaed.

Yes, I believe we've heard before how Trump didn't like his attorneys taking notes. 

 ...but hey, do what you want...you will anyway.