A federal judge ruled that GPS Fusion, the firm hired by Hillary Clinton’s 2016 campaign to dig for dirt on Donald Trump’s alleged ties to Russia must turn over nearly two dozen emails to Special Counsel John Durham.

The emails which are mostly exchanges between Clinton campaign lawyer Michael Sussmann and Fusion GPS are part of a batch that prosecutors subpoenaed last year.

Fox News reports:

U.S. District Judge Christopher “Casey” Cooper blocked prosecutors from getting 16 of those emails but allowed Durham to obtain 22. Cooper ruled that the 16 emails in question were protected by attorney-client privilege and attorney-work-product while the remaining 22 were not.

Still, the judge ruled that those emails will not be admissible in the impending trial of Sussman – who is charged with lying to the FBI during a September 2016 meeting – because of the untimeliness of Durham’s request.

Sussman is accused of relaying to the FBI concerns from cybersecurity researchers about a potential secret back channel of communications between servers of the Trump Organization and Russia-based Alfa Bank. The FBI investigated the matter but ultimately found no such suspicious links.

Prosecutors allege that Sussmann misled the FBI’s then-general counsel by saying that he was not attending the meeting on behalf of a particular client when he was actually presenting the information on behalf of the Clinton campaign and a technology executive with whom he had worked. Sussman’s trial is set to begin on Monday in Washington’s federal court. He has pleaded not guilty.

Sussmann is one of three individuals charged in Durham’s investigation so far.