Timing of Petraeus Resignation Raising Questions From Both Sides of the Aisle

Announcement came as a surprise to many in Congress who now want to know who knew what when

The revelation about General David Petraeus' extramarital affair has led to a slew of questions about who in Washington knew what and the timing of the 60-year-old's resignation.

The retired four-star general stepped down from his post as CIA director last Friday after admitting he had a relationship with his 40-year-old biographer Paula Broadwell.

It emerged over the weekend that the FBI only uncovered the affair after agents began investigating "harassing" emails allegedly sent by Ms Broadwell to Jill Kelley, a Petraeus family friend from the general's time at MacDill Air Force Base in Florida.