On an appearance on Newsmax TV, the former Nixon speechwriter said Trump's politics made him this generation's George Wallace.
"But without George Wallace's charm," Stein said. "I think he does captures a lot of anger and frustration that the ordinary citizen feels."
Stein said Trump's political solutions were "crude."
"I can't see him doing anything but damage to the Republican Party," he said.
Check out the full interview below: