On August 18th, New York Times reporter Maggie Haberman wrote the following, about Donald Trump's view of the many government documents he had kept, after his presidency:
"They're mine," three of Mr. Trump's advisors said that he stated repeatedly when he was urged to return [the] boxes of documents, some of them highly classified, that the National Archives sought after Mr. Trump took them with him to Mar-a-Lago, his private club in Palm Beach, Fla., in January 2021.
The process, as Ms. Haberman noted, involved a "nearly 18-month back-and-forth between the government and Mr. Trump," which led to the F.B.I. search at Mar-a-Lago on August 8th.
https://www.nytimes.com/2022/08/18/us/politics/trump-fbi-classified-documents.html
What Mr. Trump insisted to advisors, about the documents he had taken, is--in essence--a corollary to what he has evidently believed, since losing the 2020 election, convincingly, to Joe Biden.
The Presidency, and The White House?
"They're mine."
