Sen Bernie Sanders names 2 things Trump has done right

"I mean, I think cracking down on fentanyl, making sure our borders are stronger," Sanders told ABC's Jonathan Karl during a pre-taped segment that aired on Sunday's "This Week."

"Look, nobody thinks illegal immigration is appropriate," Sanders said. "And I happen to think we need comprehensive immigration reform, but I don't think that it's appropriate for people to be coming across the border illegally. So we've got to work now on comprehensive immigration reform."

Sanders told ABC that if Trump deports "20 million people who are in this country who are undocumented," he would "destroy the entire country."

To that, the senator responded, "Should have done much better, no argument."

Sanders has been conducting a "Fighting Oligarchy Tour." Rep. Alexandria Ocasio-Cortez, D-N.Y., joined him this past week for five events in Nevada, Arizona and Colorado.

"No matter who you voted for in the past, no matter if you know all the right words to say, no matter your race, religion, gender identity or status," Ocasio-Cortez said to thousands at a rally at Arizona State University, "no matter even if you disagree with me on a few things, if you are willing to fight for someone you don't know, you are welcome here."

The Associated Press contributed to this report.