Section 11(2)(b) in The Illegal Migrants (Determination By Tribunals) Act, 1983
(b)there are reasonable grounds to believe that the person named in the application is an illegal migrant, the Tribunal shall issue a notice accompanied by a copy of the application, to the person named in the application, calling upon him to make, within thirty days from the date of receipt of the notice, such representation with regard to the averments made in the application and to produce such evidence as he may think fit in support of his defence: