"You saw what happened about taking the Fifth Amendment and her ringleaders getting immunity deals," Trump said at a campaign rally in Bedford, New Hampshire. "We'll call them, really, the FBI Immunity Five."
He continued: "They gave so much immunity there was nobody left to talk to. There was nobody left! Except Hillary! They probably gave her immunity too."
In July, FBI Director James Comey announced that the agency would not recommend charges against Clinton for her use of a private email server as secretary of state.
In March, the Justice Department granted immunity to Bryan Pagliano, the former staffer who helped set up Clinton's private email server during her tenure as secretary of state. Pagliano invoked his Fifth Amendment right to decline to testify before a House committee in September 2015.
The New York Times reported in September that the FBI also had granted immunity to Paul Combetta, a computer specialist for a private company that maintained Clinton's server when it was moved to New Jersey.
On Friday, Rep. Jason Chaffetz (R-UT), chairman of the House Oversight and Government Reform Committee, told the Associated Press that the FBI granted immunity to Clinton's former chief of staff Cheryl Mills. On Tuesday, Comey told Congress that his agency granted Mills immunity in order to inspect information contained on her laptop during the investigation.
The FBI also granted immunity to 2008 Clinton campaign staffer Heather Samuelson and John Bentel, the former director of the State Department's Office of Information Resources Management.