Right after he fired the man responsible for investigating it, which by the way he told the same Russians relieved a "great pressure" on him. Oh, and then he appointed an attorney general that limited and then buried the special counsel investigation that firing triggered.
The corruption and criminality in this administration is insane. What's even more terrifying is that as a result of internet and other media filter bubbles (see Fox News/Limbaugh), you can just ignore these facts, buy into an alternate reality, or just be distracted by nonsense (Hillary's emails, Uranium one, etc.) .When Watergate happened, the presentation and filtering of facts was much more concentrated in a few influential news sources. That media was also driven by journalistic integrity and not a profit motive--as many outlets are today. The result was that the facts--and the wrongdoing-- could be made readily apparent to the public and Nixon had to resign. Today, at least 40% (probably most) of the country is isolated from the truth.
What's truly terrifying, though, is Trump--while putting out a model for taking advantage of the modern media and ability to engage in sophisticated and widespread domestic psychological warefare-- is mildly incompetent at pulling it off. Imagine what would happen if you had someone more savvy decide to use Trump's tools to impose tyranny. That's the greater danger, and i don't know you address it. New regulation of new and social media would be a good place to start, but it's going to raise a bunch of 1A issues that I'm not sure we're prepared to sort through. The bottom line , though is that where we're heading is much worse than where we are. Chew on that for a while.