Billionaire Elon Musk 'worked hard' to prevent tech giant OpenAI and a group of other American companies from signing a deal to build technology centers in Abu Dhabi during President Donald Trump's Middle East visit - unless his AI startup would also be included in the deal. This was reported by The Wall Street Journal, citing sources familiar with the details, after the tycoon announced his departure from his role in the U.S. administration as head of the government efficiency department.