Toyota, Nissan, Honda already have a few plants over here already. Most if not all of those vehicles are made in the USA for the American consumer.
A few billion won't amount to a hill of beans. So why bother.
Being president don't mean you can make changes to improve the economy. You have congress in your way and they want to know whats in it for them. They won't go this is what the president wants so lets give it to him.
You want to improve things? Get rid of all the career politicians. Then that will be a start. Bent home all the troops. Stop the all this aid we give for free to other countries.