The crucial meeting between Congress president Sonia Gandhi and NCP chief Sharad Pawar in Delhi to discuss a possible alliance with the Shiv Sena in Maharashtra has been postponed to tomorrow.  <br />'' <br />'' Sharad Pawar has convened a meeting of the NCP's core committee this evening in Pune. It is expected that the core committee will discuss portfolio allocation in the possible coalition government of NCP, Congress and Shiv Sena.<br />'' <br />'' Allies Congress and NCP have worked out a common minimum program with the Sena for government formation. Maharashtra is under President's rule since November 12 after the BJP-Sena alliance fell apart over the issue of sharing of the chief minister's post.<br />''