Here is the background for the Obama/Iran event I mentioned. We don't know if it's true or not. Punditfact says false, but they also say the following.
Quote:
Strassel said that in 2008, Obama’s presidential campaign secretly sent former Ambassador William Miller to Iran to talk with Iranian leaders.
This is a case of he-said-she-said. A single conservative scholar says Miller told him about his secret ‘08 campaign mission to Iran. Independent journalists who have covered U.S.-Iran relations extensively haven’t been able to confirm the account. There is no corroborating evidence, and Miller says it’s not true; he says he never worked on behalf of the Obama campaign, and he didn’t travel to Iran in 2008.
At PolitiFact, we believe the burden is on the speaker to back up their claim with evidence. The evidence here is insufficient, so we rate this claim False.
http://www.politifact.com/punditfact...n-during-his-/
Bolded is the actual truth, not their "false" conclusion.
It's also a different fact pattern that, if true, may or may not be illegal, though, probably, is my guess.
As I have described above, looking at past practice/enforcement is necessary to determine if Trump Jr did anything wrong, imho.