There are problems, but those problems would arise anyway. If you want to get into the United States, you're going to need to adhere to their laws, whether their laws are reasonable or not. Whether we agree with their laws or not is somewhat irrelevant, in the sense that they're going to enforce their laws and deny people entry. As we've recently seen with the executive order, whether we agree or not, the people who are covered by the executive order aren't going to be getting on the planes.
On February 15th, 2017. See this statement in context.