openly pushing a wild and racist conspiracy theory. cnn s sunlen serfaty reports. reporter: what was once a fringe white supremacist conspiracy theory has now become main mainstream. jews will not replace us. they want open borders. this is exactly their strategy. they want to replace the american electorate. reporter: with a growing number of american lawmakers openly promoting the great replacement theory. for many americans, what seems to be happening, or what they believe right now is happening, is what appears to them is we are replacing natural born, native born americans to perfectly transform the political landscape of this very nation. reporter: the racist, anti-immigrant theory that says non-white immigrants are being brought to replace america aame