Iona College professor Jeanne Zaino said Donald Trump Jr.'s participation in a meeting with Russian lawyer Natalia Veselnitskaya was "malpractice" on the part of then-campaign manager Paul Manafort.
Trump Jr. was joined in the meeting by brother-in-law Jared Kushner and Manafort.
Zaino said Manafort has the experience to know when a meeting, like the one involving Veselnitskaya, crosses any legal or ethical boundaries.
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Manafort has been a figure in Washington for decades, notably operating a powerful lobbying firm with Charlie Black and Roger Stone in the 1980s.
"I think there was some malpractice on Paul Manafort's part," Zaino said. "Somebody has to be protecting the family in these campaigns."
Eric Bolling said Trump Jr and Manafort are allowed to meet with a wide range of people, but Zaino said this was a special case.
She said that when people deal with Russian nationals, they are dealing with people from America's primary global opponent.
Playing off Zaino's point, Juan Williams asked how much of this ethical standard Trump Jr. knew about himself.
Watch the clip above.