Qatari officials pledged the money in 2011 to mark the 65th birthday of Bill Clinton, Hillary Clinton's husband, and sought to meet the former US president in person the following year to present him the check, according to an email from a foundation official to Hillary Clinton's presidential campaign chairman, John Podesta.
The email, among thousands hacked from Podesta's account, was published last month by WikiLeaks.
Clinton signed an ethics agreement governing her family's globe-straddling foundation in order to become secretary of state in 2009.
The agreement was designed to increase transparency to avoid appearances that US foreign policy could be swayed by wealthy donors, Reuters Reported.
If a new foreign government wished to donate or if an existing foreign-government donor, such as Qatar, wanted to "increase materially" its support of ongoing programs, Clinton promised that the State Department's ethics official would be notified and given a chance to raise any concerns.
Clinton Foundation officials last month declined to confirm the Qatar donation.
In response to additional questions, a foundation spokesman, Brian Cookstra, this week said that it accepted the $1 million gift from Qatar, but this did not amount to a "material increase" in the Persian Gulf country's support for the charity.
Cookstra declined to say whether Qatari officials received their requested meeting with Bill Clinton.
The State Department has said it has no record of the foundation submitting the Qatar gift for review, and that it was incumbent on the foundation to notify the department about donations that needed attention.
According to the foundation's website, which lists donors in broad categories by cumulative amounts donated, Qatar's government has directly given a total of between $1 million and $5 million over the years.
The Clinton Foundation has said it would no longer accept money from foreign governments if Clinton is elected president and would spin off those programs that are dependent on foreign governments.
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