The student, identified publicly by his surname Wang, filmed Mr Lai from the audience while the president was speaking at the university. Using forced perspective, an optical illusion technique, Wang positioned his fingers in front of the camera so the footage appeared to show him pinching the president.
The video was posted on Douyin, the Chinese version of TikTok, with the caption: "Lai Ching-te is right here. Isn't it your once-in-a-lifetime opportunity." It was tagged with phrases including "cross-strait reunification", "oppose separatist acts seeking Taiwan independence" and "reunification is inevitable", slogans common in Chinese political rhetoric. Wang has since deleted the video, apologised and cleared his Douyin account.
Taiwan's National Immigration Agency said the student's permit was revoked for violating the "principle of equality and dignity" in regulations governing mainland Chinese people entering Taiwan. "Our country is [a] democratic, free, and pluralistic society, respecting different opinions and normal exchanges; however, people from mainland China coming to Taiwan must still comply with our laws and related regulations," the agency said in a statement.
The National Taiwan University said the student came from a partner university and that it provided all necessary assistance during the authorities' inquiry. "We respect differing opinions on public policies, as rational dialogue is the cornerstone of a democratic society," a spokesperson said, adding that the incident should serve as a reminder that free speech must come with mutual respect for others.
The deportation has drawn questions from some quarters. Kuomintang politician Lin Pei-hsiang asked whether deporting the student over a social media post infringed freedom of speech, and suggested political satire should be differentiated from a real threat. Lo Wen-jia, secretary-general of Taiwan's Straits Exchange Foundation, said he respected the immigration agency's decision but hoped the incident would not affect future mainland exchange students coming to Taiwan.
Beijing regards Taiwan as part of its territory and has vowed to take it back. Mr Lai, whom Beijing labels a separatist, has repeatedly said Taiwan is a sovereign and independent country.