Mr. Band also noted how some of those donors he had cultivated were paying Mr. Clinton privately to make speeches or to do other work. One such donor, Laureate International Universities, a for-profit education company based in Baltimore, was paying Mr. Clinton $3.5 million annually “to provide advice” and serve as its honorary chairman, Mr. Band wrote.
In another email, Mr. Band wrote that Mr. Clinton had even received gifts from some donors.
The tensions came to a head when Chelsea Clinton helped enlist an outside law firm to audit the Clinton Foundation’s practices. Some interviewees told the audit team that the donors “may have an expectation of quid pro quo benefits in return for gift.” The audit suggested the foundation “ensure that all donors are properly vetted and that no inappropriate quid pro quos are offered to donors in return for contributions.”
The advice proved prescient as Mrs. Clinton faced intense scrutiny about whether donors to the Clinton Foundation had received special access to her State Department or other rewards. In August, the foundation said it would no longer accept foreign donations should Mrs. Clinton win the White House.
Mrs. Clinton has dismissed criticism of the charity as politically motivated. A spokesman for the Clinton campaign, Glen Caplin, declined to verify the authenticity of the emails, but said the hack was part of the Russian government’s efforts to use cyberattacks to influence the election in favor of the Republican nominee, Donald J. Trump.