Primary Industries Minister Teresa Kok is demanding a retraction, an apology, or RM30 million in damages from Jaringan Melayu Malaysia (JMM) president Azwanddin Hamzah.
This is over his remarks yesterday, linking her to the Seafield Sri Maha Mariamman riots last month.
A letter of demand sent by legal firm SN Nair & Partners gave Azwanddin seven days to meet Kok's demands before a lawsuit is initiated.
The letter stated that Azwanddin's remarks were "false, malicious" and "unjustified".
At a rally in Klang yesterday, the Malay-rights activist claimed Kok had links to the developer which owns the land the temple occupies.
The developer, One City Development Sdn Bhd, was accused of hiring thugs to secure the land which triggered two nights of rioting. The company has denied claims it hired thugs.
Azwanddin also claimed that Kok did not deny her links to the developer.
This is despite Kok's denial last month on the matter.
"Please stop dragging me into the fiasco of the Hindu temple in USJ. I am not related to the developer and I have nothing to do with the project," she had said.
The developer, One City Development Sdn Bhd, is owned by Bursa Malaysia-listed MCT Bhd.
MCT Bhd is in turn majority-owned by the Philippines-based Ayala Corporation.