A president is the face of a country, and is expected to be able to deliver speech well in international settings, where English is used as a lingua franca. This study examines the variation in English consonant pronunciation within President Jokowi's YouTube video recorded public speech in Eco Prosperity Week in Singapore, focusing on instances of deviation from standard English phonetics. Analysis reveals consistent patterns of variation, omission, and substitution, particularly concerning sounds such as /θ/, /ð/, /v/, /z/, /ʃ/, /l/, /t/, /s/, /k/, and /j/. Notably, the influence of his native Javanese and Indonesian language, the phonological differences among Javanese, Indonesian and English are identified as key factors contributing to these variations. This investigation highlights the complexities of second-language acquisition and the persistence of native-language interference in the spoken English of non-native speakers in high-profile international communication.

Keywords: consonants; Javanese; Indonesian; pronunciation;variation