Earlier on Friday, the Income Tax Department had filed four criminal cases against the former finance minister and his family.
Sitharaman also spoke on Nawaz Sharif's admission on Saturday that Pakistan terror outfits were behind the 26/11 terror attack in Mumbai.
The chargesheets or prosecution complaints have been filed by the I-T department before a special court in Chennai under Section 50 of the Black Money (Undisclosed Foreign Income and Assets) and Imposition of Tax Act, 2015, officials said, PTI reported. In his tweet, Chidambaram wrote, "The buzz in Delhi is that Ms Nirmala Sitaraman will be removed as Defence Minister and appointed as lawyer of the Income-tax department".
BJP chief Amit Shah wondered whether this was the reason the Manmohan Singh government "dragged their feet" on the formation of a Special Investigation Team to probe black money stashed overseas.
Addressing a press conference, the senior BJP leader said, "For some time now we have been hearing a lot of action by the I-T authorities against former finance minister P Chidambaram and his family".
She alleged that Chidambaram didn't disclose his investments to tax authorities, violating the Black Money Act, which has been brought in by Prime Minister Narendra Modi government to prosecute Indians who have stashed illicit wealth overseas.
"The present chargesheets are for not disclosing, either partly or fully, immovable assets like the one at Cambridge in the United Kingdom worth Rs. 5.37 crore, property worth Rs. 80 lakh in the same country and assets worth Rs.3.28 crore in the USA", informed Sitharaman.
Citing media reports on the I-T Department's chargesheet against the Chidambarams for non-disclosure of assets held overseas, Sitharaman alleged that the family was under the I-T scanner for "immovable assets worth Rs 5.37 crore in Cambridge and property worth Rs 80 lakh probably elsewhere in that country, and also probably assets of around Rs 3.28 crore in the US".
"As per the Income Tax estimates, Chidambaram family's illegal assets in 14 countries and 21 foreign bank accounts are expected to be worth three billion dollars". "This explains why despite Supreme Court's orders, Sonia Gandhi, former Prime Minister Manmohan Singh and the then Finance Minister P Chidambaram dragged their feet on formation of an SIT, one of the first decisions taken by the Modi government to fight black money! How could they indict their own selves", Shah tweeted.
Meanwhile, when asked to comment on the allegation, P. Chidambaram said, "You know I don't react".
Raking up the Rafale deal once again which was clinched at the government level with France, the Congress on Sunday questioned Defence Minister Nirmala Sitharaman's silence over not revealing the price at which the aircraft was purchased.
She pointed out that the Pakistan Supreme Court had disqualified Sharif from holding office because of not disclosing assets held in foreign countries.
Responding to notices from the I-T department, Chidambaram's chartered accountant said the details of property purchased by Chidambaram in Cambridge, UK, and the investments made in Chess Global and Totus Tennis were disclosed in the I-T returns for 2016-17.