1:01
9 November 2016
10 November 2016 Last updated at 10:07 GMT
You might love him or hate him but what is it like to work for him? Barbara Res was the chief engineer who built Trump Tower in New York - for a time she was one of his most trusted and closest employees.
During the presidential campaign she came out against Mr. Trump on television. She told the Today programme she can't "imagine him doing a job where he has to do something everyday".