> Despite being a power player in U.S. politics for decades, it was unclear whether or not Wyss is a permanent resident in the United States or an American citizen

According to https://www.wyssfoundation.org/about: "A native of Switzerland who now lives in Wilson, Wyoming"

Although I'm sure like any billionaire it's hard to pin down one place of residency - with such means at their disposal, surely they spend quite a lot of time in quite a lot of places.