Sen. Tom Cotton (R-AR) will introduce a bill on Tuesday that would sharply reduce the number of H-1B migrants working in U.S. white-collar jobs. The bill, to be announced Tuesday morning, would begin to count visa renewals as new visas, so ending the current practice of allowing unlimited renewals for most of the 85,000 visas granted to companies each year. The unlimited renewals policy allows roughly 750,000 H-1B visa holders to retain white-collar, career-track jobs that would otherwise have gone to young U.S. graduates. Without the exemption, the number of company-employed H-1B visa holders would drop to roughly 250,000. The...