I doubt anything will happen to Trump while in office: the Secret Service will move heaven and earth to prevent another presidential assassination. They've already got enough egg on their face from the near-misses during Trump's campaign, but the resources they dedicate to protecting candidates and former Presidents is a mere fraction of what they devote to the President while in office. A presidential assassination would utterly destroy what remains of the Secret Service's already tarnished credibility, and even seriously risk triggering a second Civil War.

I don't believe Musk has Secret Service protection, but as the richest man in the world, his private security budget is effectively unlimited.