The Clinton Foundation has generated at least $1 million in fees from six large banks, as payment for speeches made since 2002 by Democratic presidential candidate Hillary Clinton, former president Bill Clinton and Chelsea Clinton.

The speeches were sponsored and payments made by Bank of America Merrill Lynch, Citibank, Credit Suisse Financial Services, Goldman Sachs, JPMorgan Chase, the Clinton Foundation said on Thursday. An additional speech was sponsored by TD Bank on behalf of OneXOne Charity, a charitable organization. The previously undisclosed fees were first reported by the Washington Post.

The Clinton Foundation has faced questions whether, in this instance and others, it has complied with a 2008 ethics agreement to reveal its donors, the Post said.

Clinton has been criticized by Bernie Sanders, I-Vt., a rival Democratic presidential candidate, for being too cozy with large banks. Sen. Elizabeth Warren, D-Mass., has issued proposals for the banking industry that are seen as an attempt to influence Clinton's candidacy.

The Clinton Foundation did not disclose the specific amount of each bank's payments, but instead reported a range of the size of payments. Citibank, Goldman Sachs and JPMorgan Chase, for example, made payments in a range between $250,001 and $500,000.

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