WASHINGTON – The sex scandal that felled CIA Director David Petraeus widened Tuesday to ensnare the top U.S. commander in Afghanistan, Gen. John Allen, in a suddenly public drama involving a Tampa socialite, a jealous rival, a twin sister in a messy custody dispute and flirty emails.

The improbable story – by turns tragic and silly – could have major consequences, unfolding at a critical time in the Afghan war effort and just as President Barack Obama was hoping for a smooth transition in his national security team.

Obama put a hold on the nomination of Afghan war chief Allen to become the next commander of U.S. European Command as well as the NATO supreme allied commander in Europe after investigators uncovered 20,000-plus pages of documents and emails that involved Allen and Tampa socialite Jill Kelley. Some of the material was characterized as "flirtatious."