https://www.cnbc.com/2018/05/30/us-officials-plan-to-limit-visas-for-chinese-tech-students.html

The Trump administration plans to shorten the length of validity for some visas issued to Chinese citizens, the State Department said Tuesday, as President Donald Trump works to counter alleged theft of U.S. intellectual property by Beijing.

The changes begin June 11. The State Department said that under the new policy, U.S. consular officers may limit how long visas are valid, rather than the usual practice of issuing them for the maximum possible length.