Former South Carolina governor Mark Sanford (R)  and his now-ex-wife, former first lady Jenny Sanford. (Associated Press)

Former first lady of South Carolina Jenny Sanford on Monday ended speculation that she would run against her ex-husband for an open congressional seat in the state's first district.

"I think my job as mom right now is much more important, much more rewarding and much more productive," Sanford said, according to an AP report.