<h1>President attends US Open as guest of Swiss watch sponsor after imposing 39% Swiss tariffs, raising conflict concerns</h1> The president attended the US Open as a guest of a Swiss luxury watch sponsor despite recently imposing a 39% tariff on Swiss products, drawing mixed cheers and boos from a partially filled stadium; organisers asked broadcasters to avoid showing off-court disruptions. Extra security delayed the final's start, and the visit included senior administration officials and public figures in the crowd. The appearance renewed scrutiny over blurred lines between official actions and private business interests after the administration announced steep Swiss tariffs and has promoted family-branded properties and other commercial endeavors while the president resumes frequent high-profile sporting appearances.