Hillary Clinton was concerned about what banks were donating to a State Department project she pushed as secretary of state, emails show.

The project, building a U.S. pavilion at the 2010 World's Fair in Shanghai, required private donations from dozens of corporations that also donated to Clinton's political campaigns and her family's foundation. Critics have cited the overlapping fundraising as an example of Clinton mixing diplomatic and personal networks.

"Which banks have contributed to the Expo?" Clinton emailed to Kris Balderston, the aide in charge of drumming up contributions for the project, in Sept. 23.

"NONE!! First off we can't take TARP money and the ones that have paid it back have said no," Balderston replied, referring to the Troubled Asset Relief Program used to bailout Wall Street banks.

Balderston said Goldman Sachs, Morgan Stanley and JPMorgan Chase had declined to donate to Clinton's project.

"Judging from the chats w/ my friends at the banks, I think they all got together and decided not to do it," he said.

Balderston went on to assure her that Visa, Procter & Gamble and FedEx had donated millions to the pavilion.

The email was released among a batch of 551 emails posted by the State Department Saturday. It also appeared in a similarly sized trove of records published at the end of January, when the agency fell far short of a court-ordered benchmark for the production of Clinton's emails.

Clinton has taken heat on the campaign trail for her friendliness with big banks. She has accepted campaign contributions, donations to her family's charity and, in recent years, speaking fees from Wall Street. Her rival, Sen. Bernie Sanders of Vermont, has built his platform around opposition to the financial sector.

Emails released in various batches posted by the State Department since June of last year have shed light on the access Wall Street executives enjoyed while Clinton was secretary of state. Her schedules indicate she entertained corporate leaders at her State Department office and even took financial advice from big bank executives.