Hillary Clinton used personal funds to pay a State Department staffer to maintain an email server she used for both personal and government matters when she was US secretary of state, The Washington Post said on Saturday, citing a campaign official.
The unidentified official for Ms Clinton's campaign for the 2016 Democratic presidential nomination told the Post the pay arrangement with Bryan Pagliano ensured taxpayer dollars were not spent on a private server that was also used by Clinton's family and aides to former President Bill Clinton.
Ms Clinton, a former US senator and first lady, has been criticised for using the unsecured server to conduct government business when she was the top US diplomat from 2009 to 2013 and for how she handled classified information.
Mr Pagliano this week declined to produce documents and testify before a House of Representatives committee about the server, invoking his Fifth Amendment rights against self-incrimination.
Mr Pagliano was IT director for Ms Clinton’s 2008 presidential campaign and went to work for the State Department when Ms Clinton took up the Cabinet job.
The Post reported the Clintons paid Mr Pagliano $5,000 (€4,480) for computer services before he joined the State Department, citing a financial disclosure form he filed in April 2009.
Clinton has in the past hired staff to work for her simultaneously in public and private capacities, most notably top aide Huma Abedin, the Post said.
The Clinton campaign did not immediately return a request for comment on the report on Saturday.