Andrea Leadsom's controversial motherhood comments were not "malicious" they were "naive", Baroness Warsi has said.
The Conservative peer described the comments as a "slip of the tongue", shown by the way in which she immediately asked for the comments not to be printed.
Baroness Warsi added she did not want debates about motherhood and the roles of women to come back into politics.
Duncan Smith told Peston on Sunday that there had been "a black-ops" operation to destroy her reputation.
Leadsom's suggestion that being a mother would make her a better prime minister has sparked an almighty row - read exactly what she said.
A major row has erupted after Andrea Leadsom allegedly said being a mother makes her a better choice for prime minister than Theresa May.