The duo opposed the scheduled commencement of arguments by Special CBI Judge O P Saini from July 21, saying it should be slated to a later date after filing of the third chargesheet in the case.
They sought the postponement contending that completion of the probe is a pre-requisite for beginning of arguments on the charges.
Contending that Raja and other accused allegedly involved in the 2G scam were questioned by the CBI on July 18 in Patiala House court complex, the former minister's counsel argued this shows the probe is still on.
"Raja was illegally interrogated by CBI which shows investigation is on. Under what provision did the court allow CBI to quiz him if the probe had been completed?" asked senior counsel Ramesh Gupta appearing for Raja.