CNN  —  It’s rare to hear Elon Musk discuss the details of his own immigration journey. But the billionaire tech tycoon opened up about some of it over the weekend in a series of posts on the platform he owns, X, hours after the Washington Post reported that Musk began his career working illegally in the US when he was building a Silicon Valley startup in the 1990s. The newspaper’s story cited court records, company documents and former business associates, including a past CEO of the company