Mr Olmert, who was a senior Likud minister at the time the alleged incident took place, denies Ms Shtaif’s accusation.
After news of her allegation became public, Ms Shtaif reported that a former Knesset staffer contacted her with a report of being sexually harassed by Mr Olmert.
Shelly Yachimovich, another member of the Knesset, wrote on Facebook that ten years ago she was told by a former employee of Mr Olmert that he had harassed her some decades previously.
Mr Olmert, who was Israeli prime minister between 2006 and 2009, completed a one-and-a-half year prison sentence for bribery in July.
His friends have complained to the media that he no longer has the means to defend himself against the allegations.
