Democratic presidential nominee Hillary Clinton has faced fresh questions over an email controversy that has dogged her campaign since last year.
Newly released emails have raised fresh questions about the influence that donors to her family's charity had when she was secretary of state from 2009-13.
Donald Trump said the emails showed Clinton engaged in "pay-for-play" practices.
"If it's true, it's illegal," Trump said.
"You're paying, and you're getting things."
The 296 emails were released by Judicial Watch, a conservative legal watchdog group. It obtained the emails from the US State Department through a request submitted under the Freedom of Information Act.
One of the emails released by the group is from Doug Band, who was a top official at the New York-based Clinton Foundation.
In one email he pushed to put one of the charity's billionaire donors into contact with a State Department official in Lebanon.
In another, Band sought to get an unidentified person a job in the State Department.
State Department spokeswoman Elizabeth Trudeau said she could not "speak to specific cases," but said, "It's not unusual for candidates to be recommended to the department through a variety of avenues."
The Clinton campaign said neither of these emails involve Clinton or relate to the foundation's work, according to campaign spokesman Josh Schwerin.
They are communications between Clinton aides and the foundation president's personal aide, Schwerin said in a statement quoted by news reports.
Clinton never took action as secretary of state because of donations to the Clinton Foundation, Schwerin said.
Clinton's use of a private email server while secretary of state during President Barack Obama's first term is among the reasons surveys show voters find her untrustworthy. The Justice Department last month declined to file charges against Clinton over her use of the private server.
Prosecutors found there was not enough evidence to proceed despite what FBI Director James Comey characterised as "extremely careless" handling of classified information.
Judicial Watch said 44 of the emails it released had not been previously handed over to the State Department by Clinton. She has said that some 55,000 pages of emails she previously gave to the State Department represented all her "work-related" emails.
