dˈʊɹɹɪŋ ðə ɡˈʌvɚnmənt ʌv ælvˈæɹoʊ jˈʊɹɹaɪb, sˈɜːpə wʌz ɐpˈɔɪntᵻd ɐmbˈæsədɚɹ ʌv kəlˈʌmbiə tə ðɪ ˌɔːɹɡɐnᵻzˈeɪʃən ʌv ɐmˈɛɹɪkən stˈeɪts ˌoʊˌeɪˈɛs ænd hiː ˈɔːlsoʊ dɪspjˈuːɾᵻd ðə pɹˌɛzɪdˈɛnʃəl bˈɪdz ʌv tˈuː θˈaʊzənd tˈuː ænd tˈuː θˈaʊzənd sˈɪks.
During the government of Álvaro Uribe, Serpa was appointed ambassador of Colombia to the Organization of American States (OAS) and he also disputed the presidential bids of 2002 and 2006.