<ul data-eligibleForWebStory="false">Tesla's stock price dropped by around seven per cent following Elon Musk's announcement of forming the 'America Party.'President Trump criticized Musk's plan for a third party, stating it would add to confusion in the political system.Investors feared potential damage to the Tesla brand from Musk's political involvement, resulting in a $15 billion loss in market value.Musk's public feud with President Trump over political and financial matters has impacted Tesla's stock performance and deliveries.