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(NECN/NBC News: Brian Mooar) - The sudden resignation of CIA Director David Petraeus over an extramarital affair has sent shockwaves through Washington.
And the ripple effect is being felt on Capitol Hill here lawmakers are getting ready to hold hearings on a deadly attack on the American diplomatic mission in Libya.
NBC News has learned that General Petraeus conducted his own investigation into the attack that killed four Americans, and top lawmakers say they want to know what Petraeus knows.
If the General does testify this week, it would be as a civilian.
As President Obama saluted veterans at Arlington National Cemetery, Washington was consumed with the fall of one of this nation's most celebrated military heroes; CIA Director and former general David Petraeus stepped down over an extramarital affair.
"It was like a lightning bolt," said Dianne Feinstein on Fox News Sunday.
NBC News is reporting personal e-mails between Petraeus and biographer Paula Broadwell came to light after anonymous e-mails were sent to another woman who worked for the state department.
"Mrs. Broadwell sent these threatening e-mails to her, and, she was frightened and went to the FBI. Oh, I can't believe it, but, that's what it is."
The General is not under investigation, but his departure leaves a void just as Congress is beginning hearings into the deadly September attack on the U.S. diplomatic mission in Benghazi, Libya.
NBC News has confirmed that Petraeus conducted his own investigation on the ground in Libya.
"I don't see how in the world you can find out what happened in Benghazi before, during, and after the attack if General Petraeus doesn't testify," said South Carolina Sen. Lindsey Graham.
Still trusted by many in Washington, Petraeus is in a unique position to shed light on Benghazi, even as he rides out a controversy of his own.
And lawmakers here say they want to know more about the timeline of the investigation into e-mails and why they weren't briefed until the General resigned.