Who may file a complaint?

Representation of the People Act Chapter 2:01,Election Rules (published 1967-12-21, last amended 2000-09-12), http://rgd.legalaffairs.gov.tt/laws2/alphabetical_list/lawspdfs2/2.01.pdf

6. […]

(7) Where the Returning Officer has certified that thenomination paper of a candidate is invalid, the candidate or his agent mayappeal against the decision to a Judge in Chambers not later than the sixth daybefore nomination day, by filing with the Registrar and serving on theReturning Officer a notice in the form set out as Form No. 36 in the PrescribedForms Rules.