The discovery of classified documents at a think tank named after Joe Biden is raising more questions about his murky financial ties with foreign countries like China and Ukraine.

The University of Pennsylvania, which is affiliated with the Penn Biden Center, allegedly received millions in anonymous donations from Chinese sources.

Biden's China connection

The University of Pennsylvania received $54 million in Chinese donations including $23 million in anonymous Chinese donations starting in 2016, the New York Post reports.

An oversight group called the National Legal and Policy Center has asked the U.S. attorney in Delaware, who is probing Joe Biden's son Hunter Biden, to open a probe into the Penn Biden Center, alleging it is part of a "dark money nightmare."

A complaint from the NLPC notes that Hunter Biden, in a 2017 text to former business partner Tony Bobulinski, discussed finding ways to avoid registering as a foreign agent while lobbying on behalf of CEFC China Energy, a Chinese company that wired millions to Hunter Biden and his uncle James Biden.

Compromised?

The Penn Biden Center's potential foreign ties have raised concern in light of the discovery of classified documents there pertaining to Iran, the U.K., and Ukraine. Hunter Biden infamously held a lucrative, do-nothing job at a Ukrainian gas company.

Republican Elise Stefanik (NY) was among those who questioned whether the documents compromised national security, noting they were "inappropriately maintained" and "were related to Ukraine when Biden family members were on a Ukrainian oligarch’s payroll."

Biden's lawyers found the classified documents just days before the midterm elections in a locked closet while cleaning out Biden's office at the Penn Biden Center, located in Washington, D.C, but the discovery was only announced this week.

Biden used the office from “mid-2017 until the start of the 2020 campaign," an attorney said, a time period that is contemporaneous with some of Hunter Biden's most notorious foreign ventures.

What is the Penn Biden center?

Joe Biden was memorably described as "the big guy" in e-mails relating to the CEFC deal, which came about after he left the Obama White House.

The Penn Biden Center was formed during the same period, and Biden held a lucrative, no-show job as an honorary professor at UPenn during this time as well.

Curiously, various people who staffed the Penn Biden Center -- which vaguely describes itself as "ensuring the gains of global engagement are widely shared" -- went on to secure influential posts in the Biden administration, including Antony Blinken, Biden's Secretary of State.

Hunter's e-mails allude to the possibility of Hunter getting a job at the Penn Biden Center. Hunter insisted on keeping the discussions "confidential" because "there's still a lot of sensitivity around all of this."

In a stunning development, Biden's own attorney general Merrick Garland appointed a special counsel to investigate Biden's handling of classified documents after a second set of files was discovered at Biden's garage at home in Delaware.