Planning for the removal of Carlos Ghosn began as early as April 2018, well before the auto executive’s arrest on charges of financial crimes, according to court testimony by the Nissan Motor Co. insider who was instrumental in the downfall of the carmaker’s former chairman.

Hari Nada, a senior vice president at the Yokohama-based company, was answering questions posed by the attorney representing Greg Kelly, the former Nissan director who was arrested on the same day as Ghosn in November 2018 and is currently standing trial.

"I thought Mr. Ghosn’s conduct within the company raised questions of criminality well before April 2018,” Nada said in the Tokyo District Court on Wednesday. "I was conscious of Mr. Ghosn’s behavior on a range of matters, and I was concerned of that over a number of years before 2018.”