We have on record examples of former US Presidents who solved their differences with duels: <a href="http:&#x2F;&#x2F;www.history.com&#x2F;this-day-in-history&#x2F;andrew-jackson-kills-charles-dickinson-in-duel" rel="nofollow">http:&#x2F;&#x2F;www.history.com&#x2F;this-day-in-history&#x2F;andrew-jackson-ki...</a>