Former CAG Vinod Rai has tendered an unconditional apology to Congress leader Sanjay Nirupam for "wrongly mentioning" him as one of the MPs who had pressured him not to name former prime minister Manmohan Singh in the CAG report on 2G spectrum allocation.

Nirupam had filed a defamation case against Rai after the former CAG in his book in 2014 made the allegation against him and repeated it in interviews to the media.