The Elon Musk vs. Bill Gates beef that has been brewing for years now looks as though it’s raging on.

The Tesla CEO took to Twitter last week to accuse Gates of having a short position in Tesla that would need between $1.5 billion and $2 billion to close out, Bloomberg reported.

Musk said that Gates’ short position in Tesla used to be $500 million, but that it grew after Tesla “went up a lot”.

“Since Gates still has a multi-billion dollar short position against Tesla while claiming to help with global warming, I guess I have some trust issues with him too,” Musk wrote in a Tweet stream discussing Gates.