However, the oath-taking controversy sparked by two localist legislators Sixtus Leung and Yau Wai-ching of Youngspiration led to the unprecedented legal challenge from Chief Executive Leung Chun-ying and Secretary for Justice Rimsky Yuen against Yiu. On 7 November 2016, the National People's Congress Standing Committee (NPCSC) interpreted of the Article 104 of the Basic Law of Hong Kong, standardising the manners of the oath-taking when taking public office. As a result, the duo were disqualified by the court. Subsequently, the government launched a second legal action against Yiu and three other pro-democracy legislators, Lau Siu-lai, Nathan Law and Leung Kwok-hung, which resulted in their disqualifications from the Legislative Council on 14 July 2017.