https://www.theregister.co.uk/2018/02/26/h_1b_visa_reform_policy_published/

The United States Department of Homeland Security's Citizenship and Immigration Services has released new and strict rules for H-1B visas, the permit used by many-a-tech-company to bring skilled workers to the USA from abroad.

President Donald Trump campaigned on a promise to restrict use of the visas, which he claimed are used to import workers who are paid less than locals and therefore make it harder for US citizens to get a job. Trump was also uncomfortable with outsourcers' use of the visa, saying they displaced American workers. Labour hire agencies also sought the visa, bringing in people and then finding them jobs after they arrived.