Two elements were crucial here. One, is that he made a remark that Republican Lindsay Graham liked. This is key. He was giving credit to him for the strong ideas.
Also, he spoke of bringing the best workers from around the world to the country.
This is crucial.
Counter-terrorism efforts made it harder for highly educated, skilled workers to get a visa to be here. This has created a brain drain.
We need to bring these people here so they start businesses and make innovations here rather than staying elsewhere.