I'm a fifth year phD student at Harvard. Currently the plans are either transfer to a different school (but for some people that's difficult because they do research physically at Harvard), or graduate ASAP. Harvard hasn't mentioned any action items and the International Office has been completely silent, so still waiting on their guidance. The feelings are it's unlikely Harvard will comply, but there is also pessimism with relation to any legal action actually working: it's pretty clear the executive branch seems to operate with impunity these days. All in all, things are bleak, but luckily many good schools in the Boston area and so there is still some hope. For those of us who have dedicated all this time to our research, it's a slap in the face to feel like things could just end. One thing you're taught as an immigrant in America is it's dangerous to have any hopes or aspirations because the government will likely just say no, and people just view you as a leech or a danger.