Joy Reid noted that Mueller is "closing the circle, and now we're honing in on the core family."

"Lightning round: Who should be the most worried?" she said.

"Don Jr.," Elie Mystal said.

"Don Jr. I actually agree with you," Danny Cevallos said.

"Paul Butler, who should be the most worried about a guy like you coming after them?" Reid asked.

"Donald Trump Jr.," Butler said.

"Everybody agrees. If I'm Donald Trump Jr., I may want to get a good lawyer," Reid said.

"He is the weakest link," Mystal quipped.

"I love it. I mean, I love that you went out on that mic-drop note," Reid said, laughing.