Taiwans government has suggested a $100bn semiconductor deal between Donald Trump and the Taiwanese chip maker TSMC is not guaranteed, saying it must still go through government assessment and ensure its most advanced tech will stay onshore.The surprise announcement on Monday by Trump and the chief executive of Taiwan Semiconductor Manufacturing Co (TSMC), CC Wei, has prompted controversy in Taiwan, where the industry is crucial to both its economy and its national security.On Monday, TSMC said it would increase its existing US investment by $100bn, building five new cutting edge facilities on US soil.Trump said the deal meant TSMC would avoid the industry-wide 25% tariffs amid efforts to bring more manufacturing to the US and assert US trade dominance over rivals and allies. Wei said the deal meant TSMC was producing the most advanced chip on US soil.But statements from Taiwan government officials on Tuesday suggested the terms of the deal may have caught some unawares. Taiwans cabinet suggested TSMC had not yet applied for government approvals required for foreign investments of that size.The presidential office spokesperson Karen Kuo, said the assessment would take into account the interests of investors and the country. Kuo also said the government would ensure TSMC will keep its most advanced manufacturing processes in Taiwan.TSMC produces almost all of the worlds most advanced semiconductors, and the industry is often referred to as Taiwans silicon shield, incentivising the US and allies to support Taiwan against Chinese invasion in order to keep the tech out of Beijings control.Opposition figures have said the deal would reduce Taiwans defences. The defence minister, however, said he was still convinced the US would protect Taiwan.Taking away Taiwans technology sector will reduce the power of Taiwans silicon shield, said James Yifan Chen, the assistant professor in the department of diplomacy and international relations at Tamkang University in Taiwan. Taiwan without semiconductor and tech industries will be like Ukraine without nuclear weapons.The deal drew criticism from the opposition in Taiwan. The leader of the KMTs legislative caucus, Fu Kun-chi, asked Where is Taiwans national security if TSMC become ASMC and the sacred mountain that protects the country is gone?The more TSMC produces in the US, the lower Taiwans geopolitical importance will be, and the less incentive the US will have to help Taiwan in the future, said the KMT legislator Ko Ju-Chun.On Monday, Trump said that an invasion of Taiwan would be catastrophic but the TSMC investment reduced the impact on US interests. [It] will at least give us a position where in this very, very important business, we would have a very big part of it in the US, he added.Trumps second presidential term has been marked by an upending of US foreign policy, including a stunning rejection of Ukraine in its defensive war against Russia.skip past newsletter promotionSign up to Business TodayFree daily newsletterGet set for the working day we'll point you to all the business news and analysis you need every morningPrivacy Notice: Newsletters may contain info about charities, online ads, and content funded by outside parties. For more information see our Privacy Policy. We use Google reCaptcha to protect our website and the Google Privacy Policy and Terms of Service apply.after newsletter promotionTaiwan has long seen parallels between Russias invasion of Ukraine and Chinas own invasion threats, but despite Trump repeatedly questioning the worth of continuing to support Taiwan, the government in Taipei has been hesitant to criticise or question the leader of its most powerful and significant supporter.The Taiwan defence minister, Wellington Koo, said he was still convinced that the US would not abandon Taiwan. Koo said the rapid and strange changes in the international situation had raised questions about Trumps core interests, but he believed the cost of a Taiwan war was too high for the US to allow it to happen.I think it is impossible for the US to withdraw from the Indo-Pacific because it is the core interest of the US, whether from the perspective of economic growth, political views or military security, he said.Taiwans government has scrambled to deter Trump from imposing tariffs on Taiwan and crucial industries. It has sent government delegations to Washington, and promised to increase defence spending and reduce its trade surplus with the US. The TSMC deal was widely seen as a move to avoid tariffs, an outcome Trump said had been achieved, but the Taiwan minister of economic affairs, Kuo Jyh-Huei, on Tuesday rejected suggestions it was related.TSMC already has plants in the US and Japan, and its now building new a plant in Germany, Kuo said. These have nothing to do with tariffs. TSMCs global expansion is a crucial development.Additional reporting by Jason Tzu-kuan Lu and agencies