House Oversight Committee chairman James Comer is calling for a deeper look into the Penn Biden Center after Obama-era classified documents were found inside a closet at the think tank.

Comer is shifting his sights away from the documents found in President Biden's Wilmington garage after White House lawyers claimed no visitor log exists for the residence. The Republican is now requesting that the University of Pennsylvania, PBC's parent, provide a detailed list of anyone who had access to the think tank's Washington, D.C. offices.

Comer sent a letter to UPenn President Mary Elizabeth Magill on Wednesday. In addition to personnel logs, the letter--obtained by Punchbowl News--seeks information about foreign influence on the PBC, particularly donations from China.

"The Committee has learned UPenn received tens of millions of dollars from anonymous Chinese sources, with a marked uptick in donations when then-former Vice President Biden was announced as leading the Penn Biden Center initiative," Comer wrote.

PRESIDENT BIDEN IGNORES QUESTION ON WHY CLASSIFIED DOCUMENTS WERE FOUND AT HIS THINK TANK

President Biden Washington D.C.

CNN media analyst Bill Carter said that the president could use an interview that won't be "too challenging" for him.  (Anna Moneymaker/Getty Images)

Rep. James Comer

Flanked by House Republicans, U.S. Rep. James Comer (R-KY) speaks during a news conference at the U.S. Capitol on November 17, 2022 in Washington, DC. House Republicans held a news conference to discuss "the Biden family's business dealings." (Alex Wong/Getty Images) (Photo by Alex Wong/Getty Images)

"Not only were these donations made while President Biden explored a potential run for president and launched his campaign, but also as his family and associates pursued lucrative financial projects with partners in China," the letter continued. "The American people deserve to know whether the Chinese Communist Party, through Chinese companies, influenced potential Biden Administration policies with large, anonymous donations to UPenn and the Penn Biden Center."

JIM JORDAN LAUNCHES FIRST INVESTIGATION AS JUDICIARY CHAIR INTO BIDEN CLASSIFIED DOCS SCANDAL

Comer's letter ultimately requests all documents relating to donations from China, including a list of Chinese donors. It also seeks a list of all PBC employees, all individuals who had key card access to the think tank's offices, and a visitor log of everyone who met with Biden at the PBC offices.

White House lawyers have so far found three batches of misplaced classified documents from Biden's time as vice president, one at the PBC's offices and two more inside the president's home in Wilmington, Delaware.

Stop sign in front of a gate in front of a fence

General view of the gate to the access road leading to the home of President Joe Biden in Wilmington, DE on Thursday, January 12. 2023.  (Dario Alequin for Fox News Digital)

Attorney General Merrick Garland

US Attorney General Merrick Garland names an independent special counsel to probe President Joe Biden's alleged mishandling of classified documents at the US Justice Department in Washington, DC on January 12, 2023. (OLIVIER DOULIERY/AFP via Getty Images)  (OLIVIER DOULIERY/AFP via Getty Images)

Biden's lawyers uncovered the first batch of classified documents in November and said they immediately handed over the documents to the National Archives. Since then, searches uncovered two more stashes inside the garage of Biden's home in Wilmington.

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The trove of mishandled documents led Attorney General Merrick Garland to appoint a special counsel to investigate the matter last week, tapping former U.S. attorney Robert Hur.