sˈɜːpə wʌz lˈeɪɾɚɹ ᵻlˈɛktᵻd tə ðə nˈæʃənəl kənstˈɪtʃuːənt ɐsˈɛmbli ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn ɪnwˌɪtʃ hiː ʃˈɛɹd ɐ kəlˈiːdʒiət pɹˈɛzɪdənsi wɪð æntˈoʊnɪˌoʊ nævˈɑːɹɹoʊ wˈʊlff fˈɔːɹmɚ mˈɛmbɚɹ ʌvðɪ ˈɛm nˈaɪntiːn ɡɛɹˈɪləz ænd ælvˈæɹoʊ ɡˈoʊmɛz hɜːtˈɑːdoʊ ɹˌɛpɹᵻzˈɛntətˌɪv ʌvðə kənsˈɜːvətˌɪv pˈɑːɹɾi tə kɹiːˈeɪt ðə kəlˈʌmbiən kˌɑːnstɪtˈuːʃən ʌv nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn.
Serpa was later elected to the National Constituent Assembly in 1991 in which he shared a collegiate presidency with Antonio Navarro Wolff (former member of the M-19 guerrillas) and Álvaro Gómez Hurtado (representative of the Conservative Party) to create the Colombian Constitution of 1991.