As PDC president, in September 1960 Biroli led the Burundian delegation to a conference held in Brussels to discuss the decolonisation of Urundi and the organisation of elections. In November Urundi hosted communal elections. Rwagasore was placed under house arrest, hampering UPRONA's campaign, and the PDC emerged as the victor, winning 942 of 2,876 local offices. In December Biroli went to New York to address the United Nations General Assembly. Upon his return he announced his dissatisfaction with the attitudes of the Afro-Asian countries, feeling they were too hostile towards Belgium. Following ethnic violence in Ruanda, the UN General Assembly recommended the postponement of general elections in Urundi. Biroli attended a conference in Ostend in January 1961 and joined the other Burundian delegates in opposing this move, though Belgium acceded to the UN's wishes. In May Ntidendereza replaced Brioli as PDC president, and the latter became head of the party's public relations.
