Rupert Murdoch and Elon Musk are both American citizens. In fact, one of Murdoch's primary reasons for becoming an American citizen in 1985 was to comply with the Communications Act of 1934, which prevented him (or any non-citizen) from owning more than 25% of a broadcasting company.

Here's a piece of history from 1985 that talks about it: https://archive.ph/HlHrx