Orange Herring
It's a complete orange herring from Trump to drum up anti-Cuba sentiment. The most likely cause according to scientists is accidental exposure to unregulated chemicals, probably from cleaners and exterminators. Sonic devices are as credible as aliens.
From an excellent analysis in The Verge: "A much more likely explanation for the symptoms is some kind of chemical exposure, Oghalai [Chair of the Caruso Department of Otolaryngology – Head and Neck Surgery at the University of Southern California] says. That’s a lot more simple.” https://www.theverge.com/2017/9/16/16316048/sonic-weapon-cuba-us-canadian-diplomats-ultrasound-infrasound-science