EMERGING MARKETS-Brazil assets sink as corruption arrests reignite political worries

SAO PAULO, Nov 25 (Reuters) - Brazilian stocks fell and the currency weakened on Wednesday after the arrests of a key ruling party senator and an influential banker rekindled fears that President Dilma Rousseff's administration could face further problems passing austerity measures in Congress. Earlier in the day, Brazil's federal police arrested Senator Delcídio do Amaral, the ruling coalition's leader in the upper house, and André Esteves, the chief executive of Grupo BTG Pactual SA, for a