See this Time article.
http://time.com/4433880/donald-trump-ties-to-russia/
A guy who lies like this is going to get caught in an impeachable one. Looks to me like he doesn't know how not to lie. It's a pathology.
So will he be impeached?
The Republicans in Congress might prefer Pence. Most sane people would, in spite of the fact that Pence is a terrible choice. But he looks like he believes in things like the rule of law, democracy, freedom of the press and personal integrity, which is a step up from where we are.
Not sure they have the guts for it, though.