Ethical Decision-Making in Investment Analysis

John is a portfolio manager with over 15 years of experience in investment analysis. He has been tasked by his firm to advise a client on selecting high-yield bonds for their investment portfolio. During his research, John comes across a report that indicates a significant risk associated with one of the bonds he is considering. However, he is under pressure from his supervisor to recommend this bond as it has been popular among their clients.

In this situation, what should John prioritize to ensure he acts ethically in his investment analysis?