Four Republican lawmakers want the U.S. International Trade Commission to bar imports of TSMC chips built on 7nm and smaller nodes if they infringe five patents originally held by rival UMC. With Apple, Qualcomm, and Broadcom named as respondents and an initial ruling due this month, the case puts the silicon behind nearly every modern AI accelerator and flagship phone in legal jeopardy.
Four Republican members of Congress have asked the U.S. International Trade Commission to block imports of foreign-made chips that infringe U.S. patents, in a case built around TSMC's most advanced process nodes. The letter to ITC Chair Amy Karpel, obtained by Axios, argues that strategically important companies should not get special treatment when an exclusion order is on the table. Representative Ryan Zinke (R-Mont.) signed alongside Senators Tim Sheehy (R-Mont.), Roger Marshall (R-Kan.), and Bernie Moreno (R-Ohio).
The investigation, docketed as 337-TA-1443, opened in late March after a February complaint from Longitude Licensing and Marlin Semiconductor, two Dublin-registered subsidiaries of patent licensing firm IPValue Management. Vector Capital, a San Francisco private equity firm, has owned IPValue since 2014. The five asserted patents are not homegrown assets. They came from United Microelectronics Corporation, TSMC's Taiwanese foundry rival, which transferred them in 2021. That detail matters because it reframes the dispute as a licensing play rather than a manufacturing grievance.
The technical scope is unusually wide
The complaint targets non-x86 semiconductor devices fabricated on TSMC's 7nm node and everything below it. In practical terms, that band covers N7, N6, N5, N4, and N3, the families that have carried TSMC's leadership position since 2018. Apple's A-series and M-series silicon, Qualcomm's Snapdragon line, and Broadcom's networking and custom accelerator parts all live in this range. So does the bulk of the GPU compute powering current AI training clusters. Nvidia's Hopper generation was built on a customized 4N process, and the H100-class accelerators that defined the 2023 to 2025 buildout sit squarely inside the contested window.
The exclusion the complainants want is a limited exclusion order plus cease and desist orders, reaching not just the bare chips but downstream products that contain them. The Federal Register notice names TSMC, Apple, Broadcom, Qualcomm, Lenovo, Motorola, and OnePlus entities as respondents. An order written to that breadth would touch finished smartphones, laptops, and server boards, not just wafers crossing the border. The 7nm-and-below cutoff is the operative number here, because it draws the line precisely through the products with the highest unit economics and the least available second-source supply.
Why a non-practicing complainant changes the math
Longitude and Marlin manufacture nothing. They are patent holders, and that structural fact removes the usual escape valve. When GlobalFoundries went after TSMC in August 2019, seeking to bar U.S. imports of TSMC-made Nvidia and Apple chips over node-related patents, TSMC countersued with its own portfolio. Both companies dropped all litigation inside two months under a 10-year cross-license. That outcome was possible because both sides ran fabs and both sides had patents the other might infringe.
No such symmetry exists this time. TSMC has no products to read against Longitude's portfolio, so there are no counterclaims to trade. The complainants' endgame is a license fee, and the threat of an import ban is the leverage to extract it. That is a familiar pattern in semiconductor licensing, but the choice of forum raises the stakes. The ITC cannot award damages, only exclusion, which is why patent holders use it to manufacture settlement pressure against companies that cannot afford a supply interruption.
Market and policy implications
The Republican letter answers an earlier push from Arizona Democrats. Senators Ruben Gallego and Mark Kelly, with Representative Greg Stanton, warned the ITC that an order against TSMC could disrupt semiconductor production, AI development, and defense systems. Their concern is grounded in local exposure. TSMC has committed roughly $165 billion to its Arizona manufacturing footprint, and North America generated 75% of the company's revenue last year. An exclusion order would collide with the same domestic manufacturing buildout that federal policy has spent years subsidizing.
The procedural calendar leaves room before any disruption lands. An evidentiary hearing took place in February. The initial determination is due this month, and the full Commission decision is expected in October, according to Quinn Emanuel LLP, which represents TSMC and Qualcomm in the investigation. Even if the Commission issues an exclusion order in October, it faces a 60-day presidential review before taking effect, a window in which the administration can veto the order on public-interest grounds. A companion suit in the Eastern District of Texas was stayed in April of last year pending the ITC outcome, which TSMC said in its annual report it cannot predict.
The realistic path runs through settlement rather than a border shutdown. A blanket ban on 7nm-and-below imports would idle production lines at Apple, Qualcomm, and Broadcom simultaneously and ripple into the AI accelerator supply that every hyperscaler is fighting to secure. That systemic risk is exactly what gives a non-practicing complainant its leverage, and it is also what makes a negotiated license the most probable resolution before the presidential review clock ever starts.
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