SYDNEY (AFP) – Australian Deputy Prime Minister Barnaby Joyce’s political future was in doubt yesterday after it emerged he was a dual citizen, placing the conservative government’s slim parliamentary majority at risk. Australia does not allow dual citizens to sit in parliament, with New Zealand confirming yesterday its citizenship was automatically granted to Mr Joyce via his father. The revelation has major implications for Prime Minister Malcolm Turnbull’s coalition government, which won elections last year with a one-seat majority. Mr Joyce has refused to step aside, instead referring the case to the High Court.