Four senators are requesting detailed information by Monday from the FBI following director James Comey's announcement that the agency is investigating additional emails relating to Democratic nominee Hillary Clinton’s use of a private server for official business.

The news was first reported by Frank Thorpe, a producer and off-camera reporter for NBC News.

"Just ten days before a presidential election, the American people deserve more disclosure without delay regarding the FBI's most recent announcement. Anything less would be a disservice to the American people," wrote Democratic Sens. Dianne Feinstein, Thomas Carper, Patrick Leahy and Benjamin Cardin in a letter to Comey and Attorney General Loretta Lynch.

Comey on Friday said the agency was looking into emails it found on the computer of former Congressman Anthony Weiner, the estranged husband of Hillary Clinton's top aide Huma Abedin.

But few details beyond the announcement were released.

"Based on Director Comey’s internal memo to FBI staff, it is not clear whether FBI agents have even obtained or reviewed the emails in question. And based on press reports, it appears possible that a significant number – if not all – of the emails could be duplicates of emails already reviewed by the FBI," wrote the four senators. "Accordingly, no later than Monday, October 31, 2016, we request that you provide us with detailed information about the investigative steps that are being taken, the number of emails involved, and what is being done to determine how many of the emails are duplicative of those already reviewed by the FBI. Just ten days before a presidential election, the American people deserve more disclosure without delay regarding the FBI’s most recent announcement. Anything less would be a disservice to the American people.”