Trump signals direct call with Taiwan president, breaching 47-year diplomatic protocol
Move threatens US-China détente days after Beijing summit, creating acute uncertainty for TSMC and semiconductor supply chains
President Trump said on May 20 he will speak directly with Taiwan President Lai Ching-te, threatening to rupture the diplomatic protocol that has governed US-Taiwan relations since 1979 when Washington shifted formal recognition to Beijing.
The statement, made at Joint Base Andrews before boarding Air Force One, came just five days after Trump’s May 13-15 summit with Chinese President Xi Jinping in Beijing, where Xi warned that disagreements over Taiwan could lead to “clashes and even conflicts” if not handled carefully, according to NBC News. Trump told reporters: “I’ll speak to him. I speak to everybody. We have that situation very well in hand. We’ll work on that Taiwan problem.”
The language—”that Taiwan problem”—mirrors Beijing’s framing and signals Trump’s willingness to use the island as a negotiating lever. Taiwan President Lai responded on May 21 that he would be “happy” to speak with Trump, emphasizing that channels “were always open” while positioning China as the “disruptor of peace and stability in the Taiwan Strait,” per Al Jazeera.
The last direct presidential-level call between the US and Taiwan occurred in December 2016 when President-elect Trump spoke with then-President Tsai Ing-wen, provoking Beijing’s formal complaint. No sitting US president has spoken directly with a Taiwan leader since Washington shifted diplomatic recognition to Beijing in 1979 under the One China policy.
Arms sales as leverage
Trump’s statement comes as the White House weighs approval of a $14 billion arms sales package to Taiwan that Congress authorized in January 2026. The decision remains pending as of May 21, creating uncertainty over whether Trump will proceed with the transfer or use it as a bargaining chip with Beijing, CNN reported.
Taiwan Defense Minister Wellington Koo expressed cautious optimism: “Given that US policy toward Taiwan remains unchanged, I think we remain cautiously optimistic about arms purchases.” China’s Defense Ministry spokesperson Jiang Bin countered by accusing Lai of seeking “Taiwan independence through reliance on external forces” and “attempting to change the fundamental status quo.”
According to the American Enterprise Institute, US Secretary of State Marco Rubio acknowledged that Taiwan “did not feature prominently” in the Xi-Trump summit discussions, though he noted Beijing had “previously been very upset” about an $11 billion weapons sale approved in 2025.
Semiconductor markets absorb geopolitical risk
The protocol breach carries immediate implications for Taiwan Semiconductor Manufacturing Company, which controls 72.3% of the global foundry market and fabricates advanced chips for Apple, NVIDIA, and Amazon. According to 24/7 Wall St., TSMC stock dropped to $395.95 on May 18, down 3.12% amid escalating geopolitical tensions following the Trump-Xi summit.
Despite operational strength—TSMC reported $35.9 billion in Q1 2026 revenue, up 35.1% year-over-year, with gross margins of 66.2% and raised full-year guidance to above 30% growth, per its SEC filing—the company faces a geopolitical risk premium on its valuation. High-performance computing now represents 61% of revenue, exposing the chipmaker to any disruption in cross-strait stability.
Polymarket assigns a 98.35% probability that China does not invade Taiwan by June 30, 2026, and 92.55% through year-end, suggesting markets view immediate military escalation as unlikely. However, the diplomatic breach introduces volatility into semiconductor Supply Chains at a moment when AI accelerators are tracking mid-to-high 50% compound annual growth rates through 2029.
“I’m not looking to have somebody go independent…we’re supposed to travel 9,500 miles to fight a war. I’m not looking for that.”
— President Donald Trump
Signal or strategy
Trump’s phrasing suggests ambiguity on Taiwan’s strategic value. While signaling openness to dialogue with Lai, he also framed the island as a transactional problem to be “worked on” rather than a security commitment, Euronews noted. The contradiction—publicly announcing a call that violates protocol while downplaying willingness to defend Taiwan militarily—creates uncertainty for allies and adversaries alike.
Beijing has not yet issued a formal response to Trump’s May 20 statement, though state media has intensified criticism of Lai as a separatist. The Japan Times reported that regional observers view the move as consistent with Trump’s transactional approach to alliances, where security commitments become negotiable inputs rather than fixed principles.
What to watch
Whether Trump follows through with the call—and when—will signal his willingness to risk near-term friction with Beijing over Taiwan policy. The timing and substance of any conversation will matter: a perfunctory courtesy call differs materially from substantive discussions on arms sales or defense coordination.
Beijing’s response will clarify whether Xi treats the breach as a manageable irritant or a red line requiring retaliation. Watch for movement on the $14 billion arms package approval, which would confirm Trump’s willingness to proceed despite Xi’s summit warnings. TSMC’s stock performance in coming weeks will reflect market assessment of cross-strait stability—any sustained decline below $380 would indicate investors pricing in elevated conflict risk.
Finally, monitor whether other US officials—particularly Defense Secretary Pete Hegseth or Indo-Pacific Command leadership—offer clarity on military posture toward Taiwan. Divergence between Trump’s transactional rhetoric and Pentagon reassurances would signal policy incoherence rather than deliberate strategic ambiguity.