He said go back to where you came from, fix the issues there and then come back and fix the problems here. He is not racist. I would definitely believe a member of his Cabinet and an African-American who works for him.
I introduce Ben Carson, for those of you that don't know who he is:
Why should they go fix problems in other nations rather than working on the problems in their own nation?
The sentiment is clear, and like I've said, the whole tweet, his additional tweets explaining the first one and all the other explanations don't make it any better.
It's no less racist to say to members of congress who all happen to be female and minorities to go fix other nations because of how ****ed up those ****-holes are and then come back to show us how it's done. He once again makes a comment to the effect of these other nations are ****ed up because the people there are less than. And he tells these women basically to shut up about their issues with the U.S. because the people in their ancestral nations don't know how to run a government, so by extension these women don't know how to run a government.
And Trump being a racist or not doesn't hang on weather or not his most racists tweets are racist.