Furthermore, not all Chinese nationals in Hong Kong or Macau have a Home Return Permit. Unlike the compulsory Hong Kong Identity Card, application for a Home Return Permit is voluntary. Those who do not apply for the Permit are still eligible for an HKSAR passport issued by the Immigration Department of Hong Kong, or an MSAR passport by the Identification Services Bureau of Macau. The SAR passports are only issued to Chinese nationals with the right of abode in Hong Kong or Macau. The HKSAR passport allows the holder to travel to other countries and regions, but it may not be used for travelling to Macau. The HKSAR passport is also used as a travel document for travel to Taiwan in conjunction with the Exit and Entry Permit issued by the government of Republic of China. Chinese nationals holding an HKSAR passport cannot use it to enter Mainland China, and the HKSAR Government has stated that "in line with the one country principle, it was considered inappropriate to adopt HKSAR passport as a travel document to enter the Mainland."