How would 'merit-based' systems change US immigration?

President Trump called for the United States to shift toward a national immigration system more closely resembling a “merit-based” model employed by Canada, Australia, and others, in a speech before Congress on Tuesday.“Switching away from this current system of lower-skilled immigration, and instead adopting a merit-based system, we will have so many more benefits,” he said, according to transcripts.Recommended:Could you pass a US citizenship test?