Section 23

The Yang di-Pertuan Agong, if satisfied at any time that it is necessary in the national interest or public interest so to do, may by order—

cancel all or any postponement certificate granted in pursuance of an application under section 20 and in force at the date of the order, either generally or in relation to a specified category of persons or in relation to an individual; and

abrogate, either generally or in relation to a specified category of persons, any right to apply for the grant of a postponement certificate under that section, and the Yang di-Pertuan Agong may, by order, vary or revoke any order in force under this section, without prejudice, however, to the previous effect of that order.