The new chair of the House Oversight Committee on Tuesday notified the White House that his panel is investigating President Joe Biden's handling of classified records from Biden's time as vice president -- some of which were found in November at an office Biden had used in Washington, D.C.

In a letter to White House counsel Stuart Delery, obtained by ABC News, Republican Rep. James Comer of Kentucky asked the White House to provide all documents that were retrieved from Biden's personal office. 

The Oversight Committee is also seeking a list of those who had access to Biden's office; all documents related to the handling of classified documents, including by Biden's lawyers, and the status of their security clearance; and all documents between the White House, the Department of Justice and the National Archives and Record Administration (NARA), Comer wrote.

He asked for those documents by

His letter was not accompanied by a subpoena.

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"The Committee is concerned that President Biden has compromised sources and methods with his own mishandling of classified documents," Comer wrote.

He also wrote to NARA's acting archivist, Debra Steidel Wall, asking for similar materials.

In his letters, Comer compared Biden's handling of sensitive documents to former President Donald Trump, whom federal authorities have said took classified records back to his Florida home after leaving the White House in 2021.