WASHINGTON, D.C.: Senior FBI and CIA officials are set to brief top lawmakers on Capitol Hill on Tuesday about their investigation of an affair that ended the career of Central Intelligence Agency Director David Petraeus and sparked concerns about a possible security breach.

Petraeus, an American hero credited with turning the tide of the Iraq war, resigned on Friday (Saturday in Manila) after admitting an extramarital affair, sending shockwaves around Washington just three days after President Barack Obama’s re-election.

Peter King, the top Republican on the House Homeland Security Committee, on Sunday questioned why, if there were serious concerns about comprised intelligence, it had taken several months for the FBI to finally notify the Obama administration.

The US government is closed on Monday as part of the Veterans Day holiday. But on Tuesday, when the government reopens, senior FBI and CIA officials were scheduled to meet with leading members of Congress to bring them up to date about details of the probe, media reports said.

It has emerged that the woman he was having an affair with is Paula Broadwell, a 40-year-old former Army major granted unprecedented access to the general as she co-authored a best-selling biography: “All In: The Education of General David Petraeus.”

Newspaper reports on Sunday (Monday in Manila) revealed that the affair came to light after the FBI was called in as part of a criminal investigation launched when a second woman complained that she had received vicious emails from Broadwell.

“It didn’t start with Petraeus, but in the course of the investigation they stumbled across him,” an unnamed congressional official briefed on the matter told The New York Times.

The threatening and harassing emails from Broadwell, a married mother of two, indicated that she thought the other woman was a potential rival for the 60-year-old general’s affections, officials told the US media.

A government official told The New York Post that the emails contained such language as: “I know what you did,” “back off” and “stay away from my guy.”

US media identified the other woman as 37-year-old Jill Kelley, a “social liaison” to a Florida air force base who apparently had a longstanding friendship with Petraeus but no official status in the military.

The recipient of the emails was so frightened, according to the Washington Post, that several months ago she went to the FBI for protection and to help track down the sender.

The FBI soon uncovered Broad-well’s sexually explicit correspondence with Petraeus, leading to initial fears of a national security breach if someone had broken into the CIA chief’s private email account.

Broadwell lives in North Carolina with her radiologist husband Scott and their two young sons. She planned to celebrate her 40th birthday with a big party in Washington this weekend, but the event was reportedly canceled.

Kelley said in a statement that her family and the Petraeuses had been friends for five years. Her husband, also named Scott, is an oncologist.

A close friend of Petraeus told ABC News it was “very clear there was nothing going on other than friendship” between the general and Kelley.