In 1790, Amar was elected vice-president of the Grenoble directory, and became a deputy to the National Convention for the département of Isère, and joined The Mountain, voting in favor of Louis XVI's execution during his trial.
ɪn wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd nˈaɪnti, ˈæmɚ wʌz ᵻlˈɛktᵻd vˈaɪspɹˈɛzɪdənt ʌvðə ɡɹˈɛnoʊbəl dᵻɹˈɛktɚɹi, ænd bɪkˌeɪm ɐ dˈɛpjuːɾi tə ðə nˈæʃənəl kənvˈɛnʃən fɚðə dˈeɪpɑːɹtmənt ʌv ˈaɪsɚ, ænd dʒˈɔɪnd ðə mˈaʊntɪn, vˈoʊɾɪŋ ɪn fˈeɪvɚɹ ʌv lˈuːi ɹˌoʊmən sˈɪkstiːn ˌɛksɪkjˈuːʃən dˈʊɹɹɪŋ hɪz tɹˈaɪəl.