PRESIDENT Biden is facing an independent investigation — after a second batch of secret papers was found in his garage alongside his 1960s sports car.
The White House was left red-faced yet again after the hapless US chief was found to have left more documents in his Delaware home.
The US President faced a barrage of questions from reporters earlier ahead of a speech on the US economy.
He said he would cooperate fully with any probe, and said he took the matter "seriously", adding that they were "not sitting out in the street".
It's not clear how sensitive the documents were, or why the news has only just been revealed.
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The President said: "My lawyer has reviewed other places where documents from my time as vice president were stored, and they finished the review last night.
"They discovered a small number of documents of classified marking in storage areas and file cabinets in my home and my personal library. This was done in the case of the Biden Penn Center.
"The Department of Justice was immediately notified. And the lawyers arranged for the Department of Justice to take possession of the documents.
"So you're gonna see, we're gonna see all this unfold, I'm confident." Robert Hur, a prosecutor who has worked on terrorism and corporate fraud, will lead the investigation into the documents, found in his personal library and garage.
The US Justice Department has already spent months looking into the retention by Donald Trump with classification markings found at the former president's Florida estate.
New House Speaker Kevin McCarthy, a California Republican, called on Congress to investigate.