Good gosh that's the single most desperate attempt to criticise him I've ever, ever seen. And that's really something. To think that person actually took time to research and find something, anything within his tweet he could put a racist edge on.
If you type that into google as a direct quote it comes up with several pages from right wing sources.
Any decent journalist would have known or found this easy. Heck anyone who can type into google properly would have.
Go ahead give it a try. You will find many types of sites linking alt right racist views including published papers.
It's not a common phrase but any group or persons who study or know about the racist element would have known this and its links.
Mad the stuff you choose to defend.