I do not believe he could be impeached as nothing he has done meets the criteria. I would like to see him impeached because I have great fears about the direction he is "leading" this country and what he has done.
I don't care what his "race" (a pretty nebuolous concept in reality), color, religion, etc are. Those are his heritage, choices, genetics, etc. The ones he chooses are his choices for him. The ones that just are, just are and don't matter. It is his actions, choices, etc that he is making as president (vs. personal choices) that I disagree with.
So can he be impeached; I don't think so. Heck, I would not mind if he chose to resign (don't expect it), was impeached, or left office some other way (though I do NOT wish him any physical harm). I would just like to see him out of office (or completely change his direction) as soon as possible.