TSMC's planned $265 billion Arizona build drew direct diplomatic pushback from Beijing this summer, as China's Los Angeles consulate urged Arizona Gov. Katie Hobbs to halt political engagement with Taiwan ahead of Taipei opening its 14th U.S. representative office in Phoenix.

Taiwan Semiconductor Manufacturing Co. announced in July it would expand its existing Arizona commitment from $165 billion to $265 billion — the largest foreign direct investment in U.S. history. The expansion covers additional fabs at the North Phoenix campus, where TSMC already produces advanced logic wafers for customers including Apple and Nvidia.

What do the Chinese letters say?

KJZZ obtained two letters from the Chinese Consulate addressed to Hobbs through a public records request. One urges Arizona to stop "any gimmicks that harm the friendship and cooperation between China and the state of Arizona." A second accuses Arizona, by permitting the Taipei Economic and Cultural Representative Office (TECRO), of "lending credence to Taiwan's independence."

Hobbs' office replied that Arizona "will continue pursuing economic relationships with Taiwan that adhere to the broader U.S. foreign policy framework" — the long-standing one-China posture that permits commercial and military dealings with Taipei but stops short of formal recognition. TSMC is Taiwan-based but operates as a privately held foundry; the company has avoided weighing in on cross-strait politics.

How deep is the Phoenix-Taipei connection?

Phoenix named Taipei a sister city in 1979, the same year Washington formally derecognized the Republic of China government in Taipei. Sen. Barry Goldwater sued the Carter administration over that switch.

The Taiwan Ministry of Foreign Affairs said earlier this summer it would open a TECRO in Phoenix — its 14th in the United States. Unlike a formal consulate, a TECRO operates under the constraints of U.S.-China-Taiwan diplomacy. The American equivalent is the American Institute in Taiwan, a nonprofit that functions as Washington's representative office in Taipei.

The Phoenix facility will support investment coordination, serve as a contact point for Taiwanese nationals, and provide consular services such as passport issuance. Estimates of Taiwanese nationals in Arizona range from 2,800 in older U.S. census data to 30,000 in a figure cited last year by Taiwan's president.

Could Beijing's warnings chill the semiconductor deal flow?

Not visibly. The Arizona Commerce Authority led a delegation of roughly 100 state and city officials to Taiwan at the start of this month. TSMC Arizona's president told KJZZ the company came because its customers asked it to. Her focus, she said, is on ramping fab construction, recruiting vendors, and tightening local supply chains — not geopolitics.

Lily McElwee, president of the Phoenix Committee on Foreign Relations, said the letters track Beijing's standard playbook. "They very much adhere to Beijing's firm stance that it will do whatever it takes to reduce Taiwan's international space," McElwee said. "We're going to see Beijing react to any, any development that will enhance awareness of Taiwan and cross-strait relations in Arizona or elsewhere, and so these letters fall squarely within what I would expect from Beijing."

Why does Taiwan's chip output still matter to Arizona?

Even with TSMC's Phoenix expansion, the most advanced wafers continue to ship from Taiwan. One expert who prepared a federal report on semiconductor supply risks told KJZZ that a China-Taiwan conflict remains the single largest threat to the chip industry, because U.S. customers — Apple, Nvidia, AMD and others — still depend on leading-edge production on the island.

That dependency gives the Arizona build its strategic weight: every advanced chip entering U.S. systems still originates on the island for now. Expect more consular correspondence and more U.S. fab announcements as both sides press their positions.