Now the Republican nominee feels he has more proof that he's been right all along.
The FBI sent another letter to members of Congress on Sunday afternoon informing them that further review of Clinton emails found on Anthony Weiner's laptop didn't change their conclusion in July to clear her of criminal wrongdoing.
Trump, however, took issue with the process — after praising the FBI and Director James Comey for having taken up the review last week. The praise was a reversal from past comments painting Comey and the FBI as politically motivated in their recommendations over the summer and casting them as members of a rigged system.
"Right now, she is being protected by a rigged system. It's a totally rigged system," Trump said Sunday. "I've been saying it for a long time. You can't review 650,000 new emails in eight days. You can't do it, folks."
Not all of those emails were Clinton's, but Trump often talks about them as though they were — a line used Sunday by his campaign manager, Kellyanne Conway.
"Do you think that they went through hundreds of thousands of emails in a week? Because that may strike a lot of Americans as unusual," Conway said on MSNBC. "I don't know if I'd have the capacity to do that."
While the decision effectively closes the matter for the Clinton campaign, Trump believes it's not over.
"The investigations into her crimes will go on for a long, long time. The rank-and-file special agents at the FBI won't let her get away with her terrible crimes," Trump said.
He added later: "Hillary Clinton is guilty. She knows it. The FBI knows it. The people know it."
His anti-Clinton crowd that chanted, "Lock her up!"
"And now it's up to the American people to deliver justice at the ballot box on November 8th," Trump said.