Critics argue the program takes jobs away from American workers, who are purportedly President Donald Trump’s top priority. Will this de facto ban on H-1B visas protect American workers? There are shortages of American STEM workers, and a de facto ban on H-1B visas would make several things more likely. Opponents of the H-1B program base their critique on faulty assumptions. There’s also evidence that H-1B workers boost workers’ wages at their firms.