Acting special inspector general for Afghanistan quits

The acting U.S. inspector general for Afghanistan is resigning, removing the White House's only real contender for the post and injecting new uncertainty into a troubled watchdog office.

Herb Richardson will be leaving for a job in the private sector, according to a source close to him. Richardson had been in the job for months, undergoing a frustratingly long confirmation process.

Richardson replaced Arnold Fields, who was fired by the White House after months of congressional criticism.