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Cymer is the linchpin of ASML's leadership. Other litho machine developers like Canon and Nikon almost dropped out of the industry because they couldn't develop functional EUV light sources. ASML got around that by buying Cymer. And ASML has multiple other R&D labs and offices in the US handling critical technologies like software and robotics

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A quick Google search suggests ASML bought Cymer for the patent portfolio, while the tech didn't quite pan out. It seems like Trumpf is the current supplier of the EUV source.

This is most definitely not true. Trumpf makes CO2 lasers which are used by Cymer to produce EUV radiation via excitation of liquid tin droplets.

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