What makes you say Trump is "unpopular with most Americans"?
Trump/s approval rating has consistently hovered around 30%. Whereas his unfavorable rating has been over 50%. Though, as the GirlNextDoor correctly pointed out, a far better descriptor would have been "majority" rather than "most".
The Huffington Post keeps an up to date Meta-analysis or every poll measuring the favorable/unfavorable rating of Clinton and Trump. Where as you can always find polls that are outliers and shows the two neck and neck - this sort of information isn't helpful. However, an aggregate of all the polls helps plot any trends that may be developing. And, as best we can tell, it doesn't seem like Trump is gaining any traction with American voters. Unsurprisingly, the majority of people seem not to like him.
http://elections.huffingtonpost.com/pollster/donald-trump-favorable-rating