The Enforcement Directorate on Wednesday summoned Congress interim president Sonia Gandhi and Congress MP Rahul Gandhi over the National Herald case, which the Congress claims was closed by the investigating agency in 2015. "The BJP is using puppet agencies to intimidate political opponents. National Heral has a history that goes back to independence days," Congress leader and senior advocate Abhishek Manu Singhvi said adding that all opposition leaders including Mamata Banerjee, Farooq Abdullah are under the attacks from central agencies. "All companies do improve balance sheet by turning loans into equities, Singhvi added