Elon Musk, the CEO of Tesla, courted two scandals on Thursday, accusing a US regulator of attempting to suppress free speech while also receiving criticism for comparing Canada’s prime minister to Adolf Hitler. Attorneys for Musk, a longtime opponent of the Securities and Exchange Commission (SEC), accused the agency of conducting “endless unjustified investigations” into the Tesla CEO and his company in a letter to US District Judge Alison Nathan. “The SEC appears to be relentlessly investigating Mr. Musk and Tesla, partly because Mr. Musk remains an outspoken critic of the government,” Spiro said. Nathan oversaw a 2018 settlement in...