BRASILIA (Reuters) - Brazil's Senate forged ahead with impeachment proceedings against President Dilma Rousseff on Monday, rejecting a surprise decision by the acting speaker of the lower house, who tried to annul a key vote just days before the president could be suspended from office.
The clash between Brazil's two most senior lawmakers threw markets into disarray and threatened to drag out a painful political crisis with a constitutional standoff that could end up at the Supreme Court.
