I don't understand how receiving am email is a crime unless one acts on the information. I think they are fishing.
The press asserts that the action is taking the meeting.
DJT, Jr. gets an email that promises evidence from Russian sources, that the HIllary campaign or Hillary as SOS is involoved in criminal activity. Maybe campaign fiunding, maybe pay for play, who knows. "Dirt on Hillary being managed by the Russians."
If he takes the meeting, he is colluding with the Russians, because getting evidence that Hillary is cozy with the Russians, from the Russians, benefits the Trump campaign.
That is the logic.
<><> Trump had already clinched the nom at the time this email nonsense surfaced.
<><> the Russian contact is an official lobbyist against Russian children
being adopted by Americans. She craftily used the election angel to get a meeting.