Elon Musk delivered a mixed bag to America's governors on Saturday — telling them both that their cars will all drive themselves within a decade and that they should be worried about artificial intelligence.

Another mixed message: Musk lectured against excessive regulation in general, but added that he wanted more regulation when it comes to artificial intelligence.

Relationship with Trump: I managed to get in a question, asking Musk what it was that led him to engage with, then disengage from, President Trump. "It was worth trying," he said.

"I did my best, and I think in a few cases I did make some progress," he said. But, he added that he just couldn't justify staying on the advisory panel after Trump exited the Paris accord. "The country needs to keep its word. There's just no way I could stay on after that."

Go deeper: Here's a video of the whole thing, which is worth a watch. (Musk starts at about 35 minutes in and I make a cameo with my question on Trump at around 1:31.)