“An indictment..alleges that Trump, with the help of his body man Walt Nauta, flouted a subpoena requiring him to surrender highly sensitive documents that he kept in unsecured locations at his Mar-a-Lago residence in Florida — and that the men concealed this from federal officials as well as Trump’s own attorneys. The documents allegedly contained national defense information, including plans to attack an unidentified foreign country, and US nuclear weapons capabilities.”
https://www.vox.com/politics/2023/6/12/23758416/trump-miami-arrest-arraignment-classified-documents-indictment