SOFIA, Jan 12 (Reuters) - Bulgaria's biggest parliamentary grouping, the centre-right GERB-SDS, declined a request on Monday from the president to try and form a new government, increasing the likelihood of a snap election in the European Union's poorest member state.
Prime Minister Rosen Zhelyazkov's coalition government, backed by GERB-SDS, resigned last month after weeks of street protests against state corruption and a new budget that would have increased some taxes.
