TAIPEI, Taiwan (AP) -- Taiwan's president and top chipmaker TSMC held a joint news conference Thursday to defend the company's decision to invest $100 billion in the U.S., saying it stemmed from customer demand and not pressure from the Trump administration.

Taiwan Semiconductor Manufacturing Company (TSMC), the world's largest chipmaker, said earlier this week it would invest $100 billion in three more chip manufacturing plants, along with two packaging facilities in Arizona.

The decision sparked concerns that Taiwan would gain little in return for moving some of its most advanced manufacturing processes to the U.S.

Taiwan President Lai Ching-te denied that TSMC's investment decision was due to political pressure by the United States. U.S. President Donald Trump had previously said that Taiwan had taken away the U.S. chip business and that he wanted it back.

"TSMC's decision is necessary for its future development. The government did not face pressure from the United States during TSMC's investment process in the U.S.," said Lai on Thursday.

TSMC CEO C.C. Wei said that he had spoken with the firm's customers and realized that TSMC's current expansion plans in the U.S. were insufficient to meet current demand.

"Customer demand has been steadily increasing. For TSMC, our investment plans are based on customer needs, and we are very cautious," Wei said.

"The amount of investment in the U.S. may seem large, but it is still not enough to meet demand," he added.

He also said that the development plans in the U.S. would not affect TSMC's plans in Taiwan, and that the company currently had 10,000 employees researching and developing 1.0 nanometer chips.

While Taiwan is a self-ruled island, Beijing sees Taiwan as a renegade province to be taken back by force if necessary.

The U.S. does not recognize Taiwan as a country, but is its strongest backer and biggest arms provider.

But the continued support of the U.S. appears increasingly fragile under the Trump administration, who has contended that Taiwan relies too much on the U.S. and needs to spend more on defense. A Pentagon nominee earlier this week said Taiwan should be spending about 10% of its gross domestic product on defense to deter a war with China.

Taiwan's Lai last month pledged to increase defense spending to over 3% of its gross domestic product, up from less than 2.5%.