Democratic Progressive Party candidate Frank Hsieh questioned Ma for his possession of a US Permanent Resident Card. Ma denied having one and publicly expressed that no members of his family had one. However, the fact that Ma and his wife had applied for green cards and that his sisters and his elder daughter Lesley Weichung Ma are United States citizens caused controversy, as the DPP continued to question Ma's loyalty to the country. In response to the DPP attack on the US citizenship of his sisters and daughter, Ma commented that having a US passport or green card did not necessarily mean that someone was not loyal to Taiwan.