Memon, 53, was found guilty of conspiracy in 2007 for the serial blasts that killed over 250 people.
The US has sought their immediate extradition.
The mercy plea of Yakub Abdul Razak Memon, a death-row convict in the 1993 Mumbai serial blasts, has been rejected by President Pranab Mukherjee.
The cases were registered against Zamurrduin Ansari, Rajesh Panchariya, Mohammad Farooq Mansurian and gangster Dawood Ibrahim's brother Anees , the CBI said.
Miandad invites Musharraf, PM Aziz to son's wedding reception
Another accused Riyaz Siddiqui was sentenced for 10 years
Shankar was Director General, Special Security Bureau.
At a press conference, the Congress posed 11 questions to the PM over the Lalit Modi controversy, asking if the Modi sarkar would also extend such help to Dawood Ibrahim if he too sought such help.
Uttam Potdar and Salim Mira Shaikh were held guilty of facilitating landing of arms and RDX at Dighi coast in Raigad in February 1993.
Home secretary-level talks between India and Pakistan began in New Delhi on Sunday.
The Central Bureau of Investigation would begin recording Joshi's statement from February 28.