However, Raja is getting supports from Karunanidhi led DMK as the party spokesperson reiterated, "Untill unless Raja will be proved as a guilty, we'll continue our support."
Though no official statements have come yet from DMK or Congress led UPA government about Raja's resignation.
Raja, who has been produced before the court on Feb 3, was detained over his alleged role in 2G Spectrum scam.
Raja was arrested with his two other aides - former telecom secretary Siddharth Behura and former aide of Raja, RK Chandolia.
Raja's resignation came as a bit surprise as DMK faced several criticism over Raja's alleged involvement in the scam but was not agree to force the former telecom minister to quit from the party.
Even Raja himself refused to quit from the party earlier.
Raja's involvement in the scam created tension between DMK supremo Karunanidhi and his son Alagiri which reached to its peak when Alagiri resigned from DMK with the demand of Raja's resignation.