The report cast no new light on the causes of the headaches, nausea, memory lapses, dizziness and other ailments that were first reported by U.S. embassy officials in the Cuban capital Havana in 2016.

Marco Rubio of Florida for the role. But don’t expect that to mean cozier relations between Havana and Washington. Rubio, who if confirmed by the Senate will also be the first Latino to hold the ...