President Obama used a pseudonym in emails to Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE, documents from the FBI released Friday show.

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The FBI released a large batch documents related to its investigation into Clinton’s private email server Friday afternoon. The files include notes from interviews with several top Clinton aides, including longtime adviser Huma Abedin.

The FBI said in its notes from an Abedin interview that the address on a Clinton email chain “is believed to be a pseudonym used by the President."

Abedin said she didn’t recognize the name and “expressed her amazement” that Obama used a pseudonym.

The FBI said she exclaimed: “How is this not classified?”

She reportedly asked if she could have a copy of the email.

Abedin also told the FBI that Clinton’s team had to inform the White House that she was changing her email address so that the president could receive messages from her.