Secretary of State Marco Rubio speaks during a press conference at the House of Collections in Reykjavik, Iceland, on October 6, 2026. - Mark Schiefelbein/Pool/AFP/Getty Images

The Trump administration is struggling to get clear answers about the death of a Russian laboratory worker at an institute dedicated to studying the plague, amid days of stonewalling from Russian officials about the mysterious circumstances surrounding the episode.

The death of the technician at the Irkutsk Research An...