PM Petr Nečas won re-election as head of the center-right Civic Democrats on Sunday and must quickly tackle a rebellion among the party’s backbenchers that could bring down his cabinet this week. The leadership challenge came from one of a group of dissenters who oppose Nečas’s plans to hike taxes next year. The rebels could still bring down Nečas in a confidence motion tied to the tax bill and due for a vote on Wednesday.