Should a husband get the consent of his current wife(s) if he wishes to marry another woman?

Is it mandatory for a husband get the consent of his current wife(s) if he wishes to marry another woman? And why? If so, should he get the consent of all his wives in case he has more than one? And if it's mandatory and he doesn't get the consent, knowingly or unknowingly, or the wife/wives refuse to give the consent, but still marries another woman, would the marriage be valid?