Squinting in the sun with Elon Musk, Trump stood next to five Tesla vehicles, holding a piece of paper with handwritten notes about their features and costs. Trump said he would purchase a car himself at full price.

A new CNN/SSRS poll shows that 53 percent of Americans hold an unfavorable opinion of the world's richest man.

Elon Musk has faced "great difficulty" running his companies while trying to remake the US government. Some observers worry he's taken on too much.