Taiwan’s Top Diplomat in Washington Walks a Delicate Line

She draws much of her influence from her close relationship with Taiwan’s president, Tsai Ing-wen, who represents Taiwan’s pro-independence Democratic Progressive Party, and for whom she once serves as spokeswoman. In addition, Ms. Hsiao counts Mr. Bolton and Mr. Biden’s top National Security Council official for Asia, Kurt Campbell, as decades-long friends. For years, U.S. officials prohibited Ms. Hsiao’s predecessors from visiting the White House and the State Department. Such guidelines have relaxed over time, and she now pays regular, if discreet, visits to the West Wing and Foggy Bottom.…