Although I think I am hearing that visa holders (eg tech industry workers) on vacation or travelling for business purposes won't be able to get back in to the US, which might be challenged in court. If nothing else, return travel is one of several listed human rights in the Universal Declaration of Human Rights.
Refusing a visa holder's right of return denies a visa holder's freedom to travel.
Non-permanent-resident visa holders who live in the US also have some sort of palette of constitutional rights and INA protections. But I haven't the energy to research how they operate.
http://thehill.com/blogs/pundits-blog/immigration/255281-yes-illegal-aliens-have-constitutional-rights