Rajesh Singh, the former Fijian minister and leader of the Movement for Democracy in Fiji, told ONE News that New Zealand's Secret Intelligence Service (SIS) agents raided his home and seized items.
Singh said the agents served him with a warrant and seized his computer, phone and a photograph and questioned him over a plot to assassinate Fiji's self-imposed Prime Minister Bainimarama and Attorney General Ayaz Sayed Khaiyum.
But he said he knows nothing about the alleged plot.
He said he told the agents he hadn't discussed "anything of that nature".
"I don't condone this and I follow the law," he said he told the agents.
Singh said he will be lodging a complaint with the Ombudsman and Human Rights Commissioner over the search of his Auckland home.
A spokesman for the Prime Minister's office refused any comment. "This is an operational matter. We have no comment on security and intelligence matters."