21.  If at any time it appears to the Minister that any person not being a citizen of Singapore is a professional gambler or is engaged in the promotion of public gaming, he may issue an order banishing that person from Singapore for such period and generally in such manner as to the Minister seems expedient, and upon the issuing of the order the like consequences shall ensue in all respects as though the order had been issued under the powers conferred by the Banishment Act [Cap. 18].