Chelsea Clinton siphoned money from her family foundation to help foot the bill for her estimated $3 million wedding, according to emails released by WikiLeaks on Sunday.
The former first daughter also used foundation cash to subsidize living expenses and taxes on money gifted to her by her parents, the New York Post reported.
Doug Band, a former adviser to President Bill Clinton, pressed a top aide to Hillary Clinton in January 2012 to put a halt to Chelsea’s spending habits.
"The investigation into her getting paid for campaigning, using foundation resources for her wedding and life for a decade, taxes on money from her parents …," Band wrote to John Podesta, now Hillary Clinton's campaign chairman. "I hope that you will speak to her and end this. Once we go down this road ..."
Band told Podesta in an earlier email he had "just received a call from a close friend" of Bill Clinton's. The friend told Band that Chelsea had confided in one of George W. Bush's daughters that she was considering transfers of cash from the Clinton Global Initiative to the Clinton Foundation.
"The bush kid then told someone else who told an operative within the republican party [sic]," Band wrote.
WikiLeaks has released thousands of emails hacked from Podesta's private Gmail account over the past month. The U.S. government in October formally accused the Russian government of hacking into political networks to influence the 2016 election.
In a separate email chain, Band complained to Podesta in late 2011 and early 2012 that Chelsea's husband, Marc Mezvinsky, used his links to the Clintons and their foundation to raise cash for his hedge fund.
Band wrote to Podesta and other top Clinton confidants in January 2012 that Mezvinsky had invited "several potential investors" for his hedge fund "and a few current business ones" to a poker night fundraiser hosted by the foundation, Politico reported.
"I assume all are contributing to the foundation, which of course isn't the point," Band wrote. "The entire plan of his has been to use this for his business."
Hillary Clinton's chief of staff at the State Department, Cheryl Mills, and Virginia Gov. Terry McAuliffe were also included on the chain.
Band, who called Chelsea a "spoiled brat kid" in a previous leaked email, came under scrutiny from the former first daughter for similar accusations in December 2011.
Emails released by WikiLeaks last month revealed Chelsea had raised "serious concerns" about Band using her father's name to connect clients of his consulting firm to government officials.
The Clinton Foundation has been embroiled in controversy amid accusations of pay-to-play tactics employed by the Clintons to give donors special access to the State Department under Hillary Clinton's leadership.