Prosecutors in the corruption trial for Joseph Percoco, a former top aide to Gov. Andrew Cuomo, wrapped up their case on Tuesday by portraying Percoco as willing to abuse the powers of his office in exchange for bribes.

But defense attorneys who also presented summations on Tuesday turned their sights on Todd Howe, the prosecutors’ star witness in the case, whose credibility was continually challenged throughout the six-week trial and who was arrested at one point after admitting on the stand that he violated the terms of his cooperation agreement with the government.