Billionaire Elon Musk, a close ally of US President Donald Trump, is set to be briefed by the Pentagon on the US military's plan for a potential war with China. This marks a significant expansion of Musk's role as a Trump adviser and raises questions about conflicts of interest due to his business dealings in China. The briefing includes 20 to 30 slides outlining how the US would fight such a conflict. Washington and Beijing have had strained relations over various issues for years.