In March 1962, the PKI joined the government; party leaders Aidit and Njoto were appointed advisory ministers. The following month, the PKI held its party congress. In 1963, the governments of Malaysia, Indonesia and Philippines discussed territorial disputes and the possibility of a Maphilindo confederation (an idea introduced by Philippine president Diosdado Macapagal. The PKI rejected Maphilindo; party militants entered Malaysian Borneo, fighting the British, Malaysian, Australian, and New Zealand forces there. Although some groups reached the Malay Peninsula, planning to join the struggle there, most were captured on arrival. Most PKI combat units were active in the border regions of Borneo.