Former prime minister Najib Abdul Razak, his wife Rosmah Mansor and six others have objected to being added as third parties to a civil suit brought by A Santamil Selvi, the widow of the late private investigator P Balasubramaniam, and her three children over their exile to India in relation to the murder of Altantuya Shaariibuu.

Carpet trader Deepak Jaikishan, who is currently the only defendant in the suit, had been permitted in October last year to file third-party claims against Najib and his affiliates...