(MCT) WASHINGTON — CIA Director David H. Petraeus abruptly resigned Friday after a brief but troubled tenure as head of America’s clandestine spy service, citing his “extremely poor judgment” for engaging in an extramarital affair that the FBI had uncovered in an unrelated investigation.

The scandal threw the CIA into turmoil three days after the presidential election, and caused consternation at the White House, which had assumed the widely respected former war commander in Iraq and Afghanistan would keep his national security position in the second Obama administration.