A CPI(M) delegation met Chief Election Commissioner O P Rawat and expressed concerns over the appointment of the special observer.
The CPI(M) said the appointment "seems an unusual step".
"There have been reports of his closed-door meeting with the state BJP president in the chamber of Chief Electoral Officer, Tripura, which has created confusion among the people," the CPI(M) alleged.
A CPI(M) statement read: "The CEC said he will ask for a written report on the circumstances in which the special observer met the BJP president of Tripura."
Disclaimer: No Business Standard Journalist was involved in creation of this content