Shares of Rivian Automotive (RIVN -6.30%) are down for a second day on Friday after Reuters reported that the incoming Trump administration plans to end the electric vehicle (EV) tax credit program.As of 10:30 a.m. ET, Rivian's shares were down about 4.7% from Thursday's closing price.Broad concerns for the U.S. EV market if the tax credit program endsRivian's shares closed down over 14% on Thursday after Reuters reported that President-elect Donald Trump's transition team plans to end the consumer tax cred ...