ɪn noʊvˈɛmbɚ tˈuː θˈaʊzənd nˈaɪntiːn, hiː fˈaɪld ɐ dᵻfɐmˈeɪʃən lˈɔːsuːt ɐɡˈɛnst tˌaɪpˈeɪ mˈeɪɚ kˈoʊ wˈɛndʒˈiː fɚɹə kˈɑːmɛnt ðæt hɪz nˌɑːmᵻnˈeɪʃən fɚðə kjˈuːəmˌɪntæŋ ænd nˈuː pˈɑːɹɾi lˈɛdʒɪslˌeɪɾɚɹætlˈɑːɹdʒ lˈɪst ɪnðə tˈuː θˈaʊzənd twˈɛnti tˌaɪwənˈiːz lˈɛdʒɪslətˌɪv ᵻlˈɛkʃən kʊd ˈɪndᵻkˌeɪt ðæt tʃˈaɪnəz taɪwˈɑːn ɐfˈɛɹz ˈɑːfɪs hˈæz "kəntɹˈoʊl" ˌoʊvɚ ðə tˈuː pˈɑːɹɾiz.
In November 2019, he filed a defamation lawsuit against Taipei mayor Ko Wen-je for a comment that his nomination for the Kuomintang and New Party legislator-at-large list in the 2020 Taiwanese legislative election could indicate that China's Taiwan Affairs Office has "control" over the two parties.