Former Maharashtra CM Ashok Chavan on Monday said that Congress' Sonia Gandhi had sought a written undertaking from Shiv Sena's Uddhav Thackeray that Maha Vikas Aghadi (Sena-NCP-Congress government) must work under the "ambit of Constitution". BJP's Devendra Fadnavis commented on Chavan's remarks and said that Sena should clarify about the "deals" done before the government was formed.