For weeks Donald Trump has been saying the FBI is part of a rigged system protecting Hillary Clinton, and Sunday he began advancing a new conspiracy theory about the agency with two days left before the election.

Speaking for the first time on the FBI’s statement saying they had found no criminal activity in new Hillary Clinton emails, Donald Trump said he doubts the agency could have really reviewed all the missives in time. “You can’t review 650,000 new emails in eight days,” Trump said Sunday night in Sterling Heights, MI. “You can’t do it, folks.”

His comment echoed his campaign manager Kellyanne Conway’s position on television hours earlier: “Do you think that they went through hundreds of thousands of emails in a week?” Conway said on MSNBC. “Because that may strike a lot of Americans as unusual.”

In FBI director James Comey’s Sunday statement, he said the FBI “has been working around the clock” to process the emails, and that they were only reviewing emails sent to and from Hillary Clinton while she was Secretary of State. (The emails were found on the laptop of Clinton aide Huma Abedin’s estranged husband, former congressman Anthony Weiner.) CNN also reports that many of the newly discovered emails were personal notes unrelated to the investigation or duplicates of what had already been seen.

But Trump’s theory goes farther than skepticism about FBI agents’ ability to check all the emails. He also said the FBI actually found Clinton to be guilty of a crime and withheld it from the public. “Hillary Clinton is guilty,” he said in Michigan. “She knows it, the FBI knows it, the people know it. And now it is up to the American people to deliver justice at the ballot box on Nov. 8.”