[@The Harbinger of Ferocity] I'll refer you to Penny's quote 


[quote][u]Mueller's investigation will drag on for years yet. Watergate took years and there was something to find[/u]. If there is no collusion it will clearly be harder to prove a negative. They wouldn't be dealing with Flynn and Papadoplis if they didn't have something to offer but we will have to wait and see exactly what that is.[/quote]

Not only that, but the question that remains is, if Trump or his staff staff never had anything to hide, how come they never give a full story? 
Like the meeting with Donald Jr. and the the Russian lawyer. Why did it take weeks for them to admit it was not just him, but in fact 8 people in the room? It took multiple occasions of questions and reports to find out something Donald Jr. could have just outright stated. 
This is a consistent trend within the Trump administration. If they do have nothing to hide, they're doing a poor job at it.