You're pretty stupid, dude.
Drumpf Jr. agreed to meet with Veselnitskaya after an intermediary, publicist Rob Goldstone, told him the attorney had dirt on then-candidate Drumpf's Democratic opponent Hillary Clinton. He also told Drumpf Jr. that the information was
"part of Russia and its government's support for" his father.
http://thehill.com/policy/national-...t-with-trump-jr-was-in-touch-with-top-russian
Uday stupidly tweeted these e-mails before, you goofball, including the one with Goldstone:
The documents “would incriminate Hillary and her dealings with Russia and would be very useful to your father,” read the email, written by a trusted intermediary, who added, “This is obviously very high level and sensitive information but is part of Russia and its government’s support for Mr. Drumpf.”
Uday responded: “If it’s what you say I love it especially later in the summer.”
So Uday knew that the Russian government had "dirt" on Clinton because that's what Goldstone told him via e-mail.