Why is a man who insists "unrelenting immigration is the source of out strength" a good candidate for the presidency of the US?

Americans want to be replaced?

This clip is 57 seconds. Hear what this MADMAN has to say about the replacement of the people whose ancestors created our country

https://www.youtube.com/watch?v=UgrliuQW_-Q
Update: Correction: OUR strength
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