Its hard to prove because it would be interpreted as just attacking a leaker.
The USGovt has to be sensitive to the fact that the leaks are real information. But its far more nuanced to prove that WIKILEAKS is just pushing an anti-USA/NATO view.
Look at the Saudi Arabia leaks in light of the fact they're in a price war with Russia right now.
You won't see an Iranian leak on WIKILEAKS..and you haven't.