Trump Jr. said the picture he tweeted earlier this week was about his concern as a father of five about what could happen "if we're not vetting people and we're arbitrarily letting them into a country."

"We've seen what's going on in Europe. We can't be naive to that and pretend that's not happening there," Trump Jr. said. "If there's one death associated with it because we messed up and we didn't do it right, that's a problem for me."

He said the tweeted picture did not represent a ratio of terrorists to refugees because he "didn't say numbers of Skittles," even though the accompanying test asks if someone would take a handful of the candies knowing "just three would kill you."