Members of Congress said on Sunday they want to know more about the FBI investigation that revealed an extramarital affair between former CIA Director David Petraeus and his biographer Paula Broadwell. 

Congress is questioning Petraeus' first involvement in the FBI investigation, whether national security was compromised and why they were not told sooner about the case, according to ClarionLedger.com.

The FBI investigated harassing emails sent by Broadwell to another woman, and digging into her email files revealed the affair between Broadwell and Petraeus. The FBI contacted Petraeus and other intelligence officials, and Director of National Intelligence James Clapper asked Petraeus to resign.

Petraeus, 60, quit on Friday, Nov. 9, acknowledging his affair with Broadwell. Petraeus and his wife Holly have been married for 38 years and they have two adult children.  

Sources said Petraeus was never at the center of the FBI investigation, but when his name surfaced, agents became worrisome that Petraeus and his email accounts may have been compromised. Broadwell has made no comment since the extramarital affair was exposed on Friday, according to CBS. 

Broadwell began her work with the former CIA director as a doctoral dissertation at Harvard University but when she learned Petraeus was in the running for CIA director, she decided to turn her work into a book - "All In: The Education of General David Petraeus." Broadwell is married and has two children, the news report added. 

Petraeus told friends the affair began in August of 2011 after he left the army, according to ABC News. However, a friend of Broadwell's said the mother of two was too busy to commit "indescretions."

"I have some serious questions about who is connecting these dots and how," said David Bixler, an active duty service member who met Broadwell though a charity foundation in 2010. "Paula Broadwell is not the type ... she isn't."

Tags: FBI cia congress paula broadwell david petraeus