[quote=@Dark Wind]
They are [url=http://www.nationalreview.com/article/448587/trump-russia-watergate-nixon-not-same-all]different[/url] cases
[/quote]

Wait, you mean Muller isn't investigating President Nixon?! 

[quote=@Dark Wind]
crime committed? crime not committed? prove it. 
[/quote]

Apparently Muller is working on it.

[quote=@Dark Wind]
Also, when you're involved in those sort of legal situation: you don't often say much because people have accidentally incriminated themselves before when they didn't do anything. There is reason for saying this, or not saying that.
[/quote]

The very best you can say is that Trump's campaign had sketchy Russian connections (Mannafort) and sketchy Turkish connections (Flynn). It is easy to imagine that Trump, a relative new comer to the political stage wouldn't be aware, or at least aware of how problematic, this could become. I think its completely understandable that his legal counsel is ultra cautious. I haven't really been following the story but I haven't heard they are obstructing.