Over the course of this year, a Swiss billionaire named Hansjörg Wyss has landed himself in the crosshairs of Republicans aiming to close what they say are foreign influence “loopholes” in U.S. elections.

Wyss, 89, lives in Wyoming and is the founder of the medical device manufacturer Synthes, which was bought by the pharmaceutical giant Johnson & Johnson in 2012 for $20 billion. His fortune, routed through a pair of Washington, D.C.-based nonprofit groups funding environmental causes and other left-leaning organizations, is increasingly under the spotlight amid GOP-led investigations and demands from conservative organizations for laws to prevent alleged foreign interference.

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