The FBI has found additional documents with classified marking in Joe Biden’s home, the US president’s lawyer has said, and took some of his handwritten notes.
Mr Biden voluntarily allowed the FBI into his home, but the lack of a search warrant did not dim the extraordinary nature of the search.
It compounded the embarrassment for the president, which started with the disclosure on January 12 that the president’s attorneys had found a “small number” of classified records at a former office at the Penn Biden Center in Washington.
Since then, attorneys found six classified documents in Mr Biden’s home library in Delaware from his time as vice president.
During Friday's search in Delaware, which lasted nearly 13 hours, the FBI took six items that contained documents with classified markings, said Bob Bauer, the president’s personal lawyer.
The items spanned Mr Biden’s time in the Senate and the vice presidency, while the notes dated to his time as vice president, he said.
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The level of classification, and whether the documents removed by the FBI remained classified, was not immediately clear as the Justice Department reviews the records.
Assistant US Attorney Joseph Fitzpatrick confirmed on Saturday that the FBI had executed “a planned, consensual search” of the president’s residence in Wilmington, Delaware.
The president and first lady Jill Biden were not at the home when it was searched. They were spending the weekend at their home in Rehoboth Beach, Delaware.
Speaking to reporters during a trip to California on Thursday, Mr Biden said he was “fully cooperating and looking forward to getting this resolved quickly.”
“We found a handful of documents were filed in the wrong place,” Mr Biden said. “We immediately turned them over to the Archives and the Justice Department.”
It remained to be seen whether additional searches by federal officials of other locations might be conducted.
Mr Biden's personal attorneys previously conducted a search of the Rehoboth Beach residence and said they did not find any official documents or classified records.
The Biden investigation has also complicated the Justice Department’s probe into Donald Trump’s retention of classified documents and official records after he left office.
The Justice Department says Mr Trump took hundreds of records marked classified with him upon leaving the White House in early 2021 and resisted months of requests to return them to the government, and that it had to obtain a search warrant to retrieve them.
Mr Bauer said the FBI requested that the White House not comment on the search before it was conducted, and that Mr Biden's personal and White House attorneys were present.
The FBI, he added, “had full access to the President’s home, including personally handwritten notes, files, papers, binders, memorabilia, to-do lists, schedules, and reminders going back decades."
The Biden document discoveries and the investigation into Mr Trump, which is in the hands of special counsel Jack Smith, are significantly different.
Mr Biden has made a point of cooperating with the DOJ probe at every turn – and Friday's search was voluntary – though questions about his transparency with the public remain.
For a crime to have been committed, a person would have to “knowingly remove” the documents without authority and intend to keep them at an “unauthorised location.”
Mr Biden has said he was “surprised” that classified documents were uncovered at the Penn Biden Center.
Generally, classified documents are to be declassified after a maximum of 25 years. But some records are of such value they remain classified for far longer, though specific exceptions must be granted.