nationals under the Chinese nationality law; acquisition of Chinese nationality of ethnic Chinese residents born in Hong Kong is involuntary, although they may choose to relinquish their Chinese nationality if they hold citizenship of other countries, except for the British National (Overseas) status and the British citizenship obtained in the British Nationality Selection Scheme. Albert Ho, who had his Home Return Permit cancelled by the Central government, ran for Chief Executive in 2012. During the election campaign, Henry Tang pledged that if he became the next Chief Executive, he would talk to Beijing to secure a new permit for Ho. Leung Chun-ying gave a more generic response that did not answer to Ho specifically, and said if he became the next Chief Executive, he welcomes anyone to seek his help. Umbrella movement Three members of the Hong Kong Federation of Students led by Alex Chow, who had booked air tickets to Beijing to put their case in front of the national leadership during the 2014 Hong Kong protests, found out through airline agents that Chinese authorities had revoked their Home Return Permit, effectively banning them from travelling to Mainland. No official notification of the revocation or explanation of the grounds for their cancellation were ever made to the holders. Lee Bo In 2016, issues regarding the disappearances of Lee Bo, the owner of Causeway Bay Books, were raised by British Foreign Secretary Philip Hammond as Lee is a British citizen with a Home Return Permit who was later confirmed to be kidnapped from Hong Kong by Chinese law enforcement officials. Hammond demanded the Chinese government to launch a thorough investigation regarding the breach of independent jurisdiction rights enjoyed by Hong Kong. The Chinese Foreign Minister Wang Yi responded by saying that China would refuse to do so because Lee is, "first and foremost, a Chinese citizen (national)" under the Chinese nationality law and the Basic Law of Hong Kong, therefore the British government would have no say on internal affairs of China. This case came under international attention because, unlike Ching Cheong, Lee was neither arrested or had any charges against him in Mainland China, and his British citizen status, unlike Ching's BN(O), was recognized by the Chinese government. See also Mainland Travel Permit for Taiwan Residents People's Republic of China Exit-Entry Permit for Travelling to and from Hong Kong and Macau Residence Permit for Hong Kong, Macao, and Taiwan