Senior Senate Democrats are becoming increasingly critical of President Biden after six more classified documents were found at his home.

WASHINGTON — President Joe Biden’s decision allowing the FBI to search his home in Delaware last week opened him to fresh negative attention and embarrassment following the earlier discoveries of classified documents at that home and a former office. But it’s a legal and political calculation that aides hope will pay off in the long run as he prepares to seek reelection.

The remarkable, nearly 13-hour search by FBI agents of the sitting president’s Wilmington home is the latest political black eye for Biden, who promised to restore propriety to the office after the tumultuous tenure of his predecessor, Donald Trump.

But with his actions, Biden is doing more than simply complying with federal investigators assigned to look into the discovery of the records. The president aims to show that, unlike Trump, he never intended to retain classified materials — a key distinction that experts say diminishes the risks of criminal liability.

His attorneys have said full access was granted to the home “in the interest of moving the process forward as expeditiously as possible.”

“If I was a lawyer and I represented the president of the United States and I wanted to show, ‘I am being fully cooperative, and I do care to be projecting transparency to the American public, and I do take this seriously,’ I think this is the advice I would give as well,” said Mary McCord, a former senior Justice Department national security official.

That’s not to say she approves of his handling of the documents.

“I think it’s wrong that he had those documents there,” she said. “It shows lapses at the end of the administration,” when Biden was completing his time as vice president under Barack Obama.

Biden’s personal attorneys first discovered classified materials on Nov. 2 as they cleared out an office Biden used at the Penn Biden Center in Washington. Since that initial discovery, Biden’s team adopted an accommodating approach to the investigation, even if they haven’t been completely transparent in public.

They didn’t acknowledge the first discovery before the midterm elections, though they swiftly notified the National Archives of the discovery, returned the documents the day after they were found and coordinated subsequent searches and discoveries with the Department of Justice.

They also are not standing in the way of interviews of staff, including Kathy Chung, Biden’s executive assistant when he was vice president, who helped oversee the packing of boxes that were taken to the Penn Biden Center.

She feels some responsibility given her position, but she had “absolutely” no knowledge of classified documents being packed, according to a person familiar with her thinking who spoke on condition of anonymity.

Biden himself has said he was surprised the documents were in his possession.

It all fits a theme: Biden and his aides maintain the document mishandling was not intentional. As far as Biden’s possible legal exposure goes, the question of intention is critical: Federal law does not allow anyone to store classified documents in an unauthorized location, but it’s only a prosecutable crime when someone is found to have “knowingly” removed the documents from a proper place.

Still, welcoming the FBI search could backfire as the investigators continue, should they find some evidence of criminality.

Agents last week took possession of an additional round of items with classified markings, and some of Biden’s handwritten notes and materials from his tenure as vice president and senator.

That’s in addition to the documents already turned in by Biden’s lawyers. Agents could also choose to search the Penn Biden Center and Biden’s other home in Rehoboth Beach, Delaware, as the probe continues.

“I think he should have a lot of regrets,” added Sen. Joe Manchin, D-W.Va. Even Biden’s own attorneys have called it a “mistake.”

Republicans, meanwhile, sought to use their new-found powers in the House, where they regained the majority this month, to investigate Biden’s handling of the documents and hope to capitalize on the investigation.

“It is troubling that classified documents have been improperly stored at the home of President Biden for at least six years, raising questions about who may have reviewed or had access to classified information,” House Oversight Chairman James Comer, R-Tenn., wrote in asking for visitor logs to Biden’s residence.

Trump and some of his supporters have been more outspoken, claiming Biden is guilty of worse mishandling of classified documents than the Democrats accuse Trump of being.

The investigation of Trump also centers on classified documents that ended up at a home. In that case, though, the Justice Department issued a subpoena for the return of documents that Trump refused to give back, then obtained a warrant and seized more than 100 documents during an August search of his Florida estate, Mar-a-Lago. Federal agents are investigating potential violations of three federal laws, including one that governs gathering, transmitting or losing defense information under the Espionage Act.

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