He knows that those funds he receives are illegal but he vowed not to use them for his personal needs. What is your opinion on this matter?
Because your friend knows that it is money from corruption even though he does not use it for personal interests but politics is cruel it is very possible that your friend will also receive punishment if another politician finds out and reports it to the authorities and that will ultimately endanger your friend. Politics does not recognize friends so your friend is in a difficult situation.