Former Secretary of State Hillary Clinton’s security clearance has been revoked at her request, the State Department told lawmakers, according to a letter made public Friday. Clinton’s clearance was withdrawn on Aug. 30, according to a letter from the State Department to Senate Judiciary Chairman Chuck Grassley (R-Iowa), which he released. Story Continued Below Five others associated with Clinton, including longtime aide Cheryl Mills, also had their clearances revoked on Sept. 20, according to the letter. The aides were known as “research assistants,” which allowed them to keep their clearances after their time at the department concluded. The move comes almost a year after Grassley asked the department to investigate and review whether Clinton’s aides still had security clearance. Clinton in 2016 was investigated for her use of a private email server during her tenure as secretary of state. No charges were filed against Clinton, who was running for president at the time of the probe. This summer, President Donald Trump revoked former CIA Director John Brennan’s security clearance, and the White House has said he is reviewing several other clearances of former top officials. Clinton’s name was not on the list of those said to be under review.