In the first ministerial visit from India to Pakistan since the terror strike on Mumbai, Home Minister P Chidambaram will travel to Islamabad on Friday on a two-day trip, during which he is expected to press for a probe against Lashkar-e-Tayiba founder Hafiz Saeed and seek voice samples of the handlers of the 26/11 terrorists.Chidambaram is visiting Pakistan to attend the South Asian Association for Regional Cooperation Interior Minister's Conference on Saturday.