Responsible for overseeing investment in China's high-speed rail network, Mr Liu came under investigation for allegedly embezzling funds.

BBC: Ex China rail minister Liu Zhijun charged with corruption

They have claimed they were caught in the cross-hairs of an overzealous investigation of Liu's campaign finances.

WSJ: Trial opens for aides of NYC mayoral hopeful

The jurors also heard lawyers for Liu's ex-campaign treasurer, Jia "Jenny" Hou, and former fundraiser Xing "Oliver" Wu Pan portray them as political neophytes caught in the crossfire of an overzealous corruption investigation of Liu's campaign finances.

WSJ: NY jury begins hearing case against Liu aides