If I'm reading Trump's position correctly then if he is elected and he tries to tax Ford for building cars in Mexico then all Ford would need to do would be to build the plant in El Paso, bring in 5000 Mexicans on H-1B and H-2B visas to staff it, pay them dirt wages, and Trump would be saying, "See? I forced Ford to bring jobs back to the U.S."
Doodle H type visas are for professional services, STEM, doctors, lab researchers etc. L visas are for temp and unskilled.