 During the 2009 Malagasy political crisis, Andriamanjato was among the opposition leaders who backed Antananarivo Mayor Andry Rajoelina in his dispute with President Marc Ravalomanana; along with other opposition leaders, he submitted a petition to the High Constitutional Court on 2 February 2009 asking it to remove Ravalomanana from office.After Rajoelina declared himself head of state (while still in opposition, and not holding actual power), he appointed Andriamanjato as his Minister of Foreign Affairs.Andriamanjato participated in negotiations between Ravalomanana and Rajoelina on February 24, 2009.