NEW DELHI | GANDHINAGAR: Congress on Monday demanded the resignation of BJP president Amit Shah to ensure independent probe into his son’s business dealings and held press conferences in 12 state capitals to highlight the controversy over Jay Shah’s business.Congress spokesman Anand Sharma said Shah must quit as there cannot be an independent probe into his son’s business as long as he remains the chief of the ruling party.He also demanded that the “entire business model” of Jay Shah be made public and questioned why Union minister Piyush Goyal was holding press conference to defend the business activities of Jay Shah.“We are just demanding a fair inquiry into the suspicious business dealings of Jay Shah,” Sharma said in Delhi. “And for the sake of fair and impartial inquiry, Amit Shah must resign as the president.” An article on news website ‘The Wire’ had alleged that a company had reported “16,000 times” increase in its turnover in 2015-16 at Rs 80.50 crore.Congress spokesperson demanded the entire business model of Jay Shah be made public, especially where all the money came to it and whether the RBI guidelines were followed while giving some clearances, etc., “so that the youngsters in the country will also come to know the secret formula of a quick business success”.Urging Amit Shah to follow the examples set by former BJP presidents LK Advani, Bangaru Laxman and Nitin Gadkari who resigned when faced with allegations of corruption, Sharma said: “Remember, LK Advani had resigned in the wake of Jain Hawala scandal…Bangaru Laxman also resigned when he was caught on camera taking cash. More recently, Nitin Gadkari also resigned due to the Purti scam,” Sharma said.He also questioned PM Modi’s silence on the issue. Meanwhile, Congress vice-president Rahul Gandhi used the issue to launch a frontal attack on Modi and Shah at public meetings on the first day of his three-day visit to Gujarat.He used the controversy to take pot shots at the PM by quoting his earlier speeches and reminding people of Modi’s claim of “na khaunga, na khane dunga.”