Donald Trump administration came up with the new rules for American visas. From now on all the newcomers have to follow their plans, mentioned in their initial interview with a consular official, for at least three months after entering the USA. If during the first three months an international visitor/student/worker does something that was not mentioned during the interview, it would be considered as misrepresentation.
Breaking the rules will make it difficult or even impossible to renew a visa or get a new one. If the visitor is still in the USA, he/she will be eligible for deportation. However, there are 38 countries (Australia, New Zealand, Japan and most of Europe), which citizens don’t need a visa or an explicit plan before coming to the USA. Therefore, the new rule doesn’t generally apply to them. Last year more than 10 mln American visas were issued, supporting a large tourism industry.