Rivian CEO RJ ScaringePatrick T. Fallon/AFP via Getty ImagesDonald Trump's tariff proposals and pushback on EVs could have a significant impact on automakers.Rivian CEO RJ Scaringe said during an earnings call the company has been bracing for tariffs.The fate of the $7,500 EV tax credit issued under the Biden Administration remains unclear.EV company Rivian says it's already bracing for the impact that the increased tariffs proposed by President-elect Donald Trump would have on its supply chain.Rivian CEO RJ Scaringe said that to prepare for potential tariffs Trump has proposed on foreign goods, the company has been deliberate about materials sourcing for its upcoming lower-cost SUV, the R2."The R2 sourcing process is something we've looked at very strategically and certainly have contemplated even prior to the election, just what the impact would be, should the overall approach to tariffs change," Scaringe during the company's Q3 earnings call on Thursday — a day after the election was called for Trump."So a lot of our focus has been on sourcing suppliers that are not going to be subject to large tariffs."The CEO said Rivian also structured its partnerships with overseas suppliers that could be subject to tariffs so that the company is "not carrying much of the risk." He did not specify where the suppliers are based.Still, analysts say uncertainty surrounding the incoming administration could hurt already slowing demand for EVs.The stocks of Lucid and Rivian — smaller auto companies dedicated to EVs — saw a brief jolt.