The FBI is reviewing newly discovered emails that might be pertinent in the investigation of Hillary Clinton’s private email server after additional information came to light in connection with an unrelated case.

Utah Republican Rep. Jason Chaffetz, who serves as chairman of the House Oversight & Government Reform Committee, said Friday that FBI Director James B. Comey informed him of the development.

In a letter to the chairmen of the pertaining House and Senate committees, Comey explained that an unrelated investigation led to the revelation of the pertinent emails.

“Although the FBI cannot assess whether or not this material may be significant, and I cannot predict how long it will take us to complete this additional work, I believe it is important to update your committees about our efforts in light of my previous testimony,” Comey wrote.

Earlier in the week, Chaffetz told The Washington Post that he was planning for “years” of investigations should Clinton be elected president.