Mumbai, Jan. 28 -- Ashok Chavan, a senior Congress leader and a minister in the Uddhav Thackeray-led state government, on Monday said that his party president, Sonia Gandhi, was against joining hands with the Shiv Sena in Maharashtra, and had asked the state Congress to get a written assurance from the Sena that the government will work within the constitutional framework. While he said they did not take any written assurance from the Sena other than the common minimum programme (CMP), he insisted the Congress will walk out of the Maharashtra Vikas Aghadi (MVA) government if it violates the promise....