Victor Madrigal-Borloz traveled across country in August
Linda Thomas-Greenfield says LGBTQ+ rights remain a top priority
U.S. among 39 member countries
London-based NGO represented Rosanna Flamer-Caldera
Previous administration withdrew from body in 2018
The US is among statement signatories
Linda Thomas-Greenfield spoke at U.N. LGBTI Core Group event
President noted crackdowns in Chechnya, Cameroon
Brazilian president opened U.N. General Assembly