Congressional Republicans are demanding to see visitor logs for US President Joe Biden's homes, arguing that the discovery of classified files at one of his residences is a national security risk.
Mr. Biden acknowledged Thursday that sensitive material was found in the garage of his house in Delaware.
He told reporters that he and his team are "cooperating fully and completely with the justice department's review".
The White House deflected when asked if the visitor logs would be provided.
The justice department has appointed an investigator to look into the files.
News that sensitive documents dating from Mr. Biden's time as vice-president had been found in a private office at the Penn Biden Center, a think tank in Washington, emerged earlier this week.
That was followed by a disclosure that a second cache was discovered at Mr. Biden's home.
The discovery of the documents has been called a political embarrassment for Mr. Biden, as it comes during an ongoing investigation into former President Donald Trump's own alleged mishandling of classified files.
