I assume he means highly skilled, educated legal immigrants. That is not the same as just opening the border willy nilly.
We don't need "highly skilled, educated" immigrants.
We have plenty of native born young Americans who could use high paying jobs in tech, medicine, etc.
We need to educate our own young people (instead of allowing foreign students to study STEM in our colleges), and reserve "highly skill, educated" opportunities for our own young people.