Home Affairs on 19 April 1988 and Teo was rearrested and detained. Teo's application for a writ of habeas corpus succeeded before the Court of Appeal in Chng Suan Tze v. Minister for Home Affairs ("Chng Suan Tze") as there was insufficient evidence of the President's satisfaction that her detention without trial was necessary to prevent her from acting in a manner prejudicial to the security of Singapore or the maintenance of public order, pursuant to section 8(1) of the ISA. Although Teo was released on 8 December 1988, she was re-arrested almost immediately under a new detention order. The Government responded to Chng Suan Tze within two weeks after the decision was made. It amended the Constitution of the Republic of Singapore and the ISA by enacting the Constitution of the Republic of Singapore (Amendment) Act 1989 and the Internal Security (Amendment) Act 1989, which respectively came into force on 27 and 30 January 1989. The amendments were expressed to operate retrospectively. The constitutional amendment inserted into Article 149 the italicized portions shown below: Article 149 is primarily directed against subversion and confers power on Parliament to make laws contrary to certain fundamental liberties guaranteed by the Constitution. The enactment of the ISA, which provides for detention without trial for up to two years, was a conspicuous exercise of this power. The 1989 amendments to the ISA inserted the following provisions into the Act: The legislative amendments were intended to revert the law to its position before Chng Suan Tze was decided, thus rendering the exercise of power by the President and the Minister under the ISA not justiciable by the courts. In addition, the addition of a reference to Articles 11 and 12 of the Constitution to Article 149(1) ensured that the ISA is valid even if it is inconsistent with five out of the eight fundamental liberties enshrined in Part IV of the Constitution. Parliament was able to pass these legislative amendments without difficulty to diminish the effect of Chng Suan Tze because a large majority of the Members of Parliament belong to one political party, the People's Action Party. Further, Singapore has a unicameral legislature, so all legislative power is concentrated in one body. The legislative body is "practically fused with the executive via the Cabinet". In Teo Soh Lung, Teo applied again for habeas corpus to be released from detention. She sought to argue that