The opposition yesterday accused Prime Minister Banharn Silpa-archa of being born Chinese - which under the constitution would make him ineligible to be premier. The attack came during a no-confidence debate which is widely expected to unseat Mr Banharn. Yesterday, Parliament also heard complaints about the 'shame' of having a premier who had allegedly lied about his school qualifications and plagiarised his degree thesis. Even though no dramatic revelations have so far been made, the lengthy and detailed allegations that Mr Banharn runs a corrupt and incompetent administration have probably made it impossible for him to continue to govern, diplomats say. The state-owned television stations suddenly switched to normal programming on Wednesday night as opposition MPs rounded on Mr Banharn for hiding the alleged fact that he was born in China to a Chinese father. Mr Banharn has claimed he was born in Thailand in 1932. Democrat MP Chamni Sakdiset said Mr Banharn's father was a Tae Chiew Chinese called Seng Kim Sae Bay, born in China in 1895. 'It was a surprise to learn that Mr Banharn was born in Suphan Buri in 1932,' said Mr Chamni, 'when his father emigrated from China five years later.' Mr Chamni said he discovered the details in a 1937 immigration report card that he said all immigrants had to fill in. The MP said the Immigration Department had refused to hand over the 'classified' documents that would confirm his allegation. His sources told him these papers had already been sent to the Banharn home where they were to be 'destroyed or changed to comply with the Prime Minister's statements on his nationality', he said. Mr Banharn denied a charge that he had plagiarised his master's thesis in law, but steered clear of the charges he is not a native-born Thai.