Read more: BJP, Congress spar over Lalit Modi tweets
"Wait 4 details on #racketeer #Tentwala @SudhanshuBJP Rags to #riches story coming live via #LALITGATE in next week," Modi tweeted.
Modi, who is facing a number of investigations related to alleged financial irregularities in India, also questioned Mittal's relationship with alleged hawala operator Vivek Nagpal.
"Breaking news: world exclusive bought to u by #LALITGATE wants to know @SudhanshuBJP what is your relationship with Vivek Nagpal," Modi posted on Twitter.
On Wednesday, Modi had said Bharatiya Janata Party leader Varun Gandhi met him in London a few years ago and wanted to settle everything with his aunt and Congress chief Sonia Gandhi in exchange for money.