The party stopped attending parliamentary sessions about four months ago after ruling party lawmakers stripped some opposition lawmakers of their legal immunity. The opposition says lawsuits have been used to unfairly harass its members.
Critics say Hun Sen is manipulating the courts to weaken the opposition’s chances in next year’s local polls and the 2018 general election. The opposition made an unexpectedly strong showing in the 2013 general election, which it claimed it was cheated out of winning.