The sex scandal that's claimed the career of CIA Director David Petraeus has gotten wider.

President Barack Obama has put on hold the nomination of the top U.S. commander in Afghanistan, Gen. John Allen, to become the next commander of U.S. European Command as well as NATO supreme allied commander.

Investigators have uncovered 20,000-plus pages of documents and emails involving Allen and Tampa socialite Jill Kelley, some of which was described as "flirtatious" in nature.

It was Kelley, a close friend of Petraeus, who triggered the FBI investigation that led to his downfall as CIA director. Kelley complained about getting anonymous, harassing emails that turned out to be written by Petraeus' biographer and mistress, Paula Broadwell, who was apparently jealous of Kelley.

Petraeus acknowledged the affair and resigned last week.

In the course of looking into that situation, federal investigators came across what a Pentagon official called "inappropriate communications" between Allen and Kelley, both of whom are married.

Allen insists he's done nothing wrong, and is working to salvage his career.

As for Kelley, she's been keeping a low profile at her home. At one point today, she left her house and ignored reporters' questions as she drove off.