My uncle is a US citizen and he is visiting T&T for Carnival. Is he required to advise the US Embassy of his presence here for a short stay?
No, but if he would like to do so, he can use the Smart Traveller Enrolment Programme (STEP). We encourage all US citizens travelling or residing abroad to enrol in STEP. STEP is a free service and enrolling allows you to receive automatic updates about the foreign country where you are visiting or residing, including emergency and security messages. More importantly, this programme helps the US Embassy contact you in an emergency, whether natural disaster, civil unrest or family emergency. To sign up, visit https://step.state.gov.