Tesla value falls below magical $1tn milestone as Musk's antics fuel share sell-off

Twitter spat between Bernie Sanders and Elon Musk precedes drop of 4.5% in the electric car manufacturer's shares

Tesla CEO Elon Musk fired back at Bernie Sanders after the US senator tweeted that 'We must demand that the extremely wealthy pay their fair share'. 

Tesla shares have tumbled again, taking the electric car maker's market value below $1 trillion (€.87tn) for the second time in four sessions as investors reacted to CEO Elon Musk's recent stock sales of a combined $6.9bn.

Shares of the company, which lost some $187bn in market value over the past week, were down about 4.5%.