The Trump administration said Tuesday it is expelling 15 Cuban diplomats from the U.S. in response to a series of bizarre, unexplained health problems suffered by U.S. diplomats in Cuba. The move comes after the State Department said it’s withdrawing more than half its diplomatic staff from its Havana embassy, after workers there suffered hearing loss and brain injuries in what’s been described as a likely “sonic attack.” Cuba denies any involvement and says it’s helping to investigate the incidents. Cuban Foreign Minister Bruno Rodríguez on Tuesday accused the Trump administration of rolling back a thaw in U.S.-Cuban relations begun under President Obama.

Bruno Rodríguez: “The unwarranted and motiveless political decision to demand that 15 employees of our embassy leave the territory of the United States is an act of an absolutely political nature that only benefits those who want to derail the possibility that relations between both countries continue to move forward, and those who want to turn back the progress achieved over the past few years.”