Comment by Larrikin

So that foreign nationals think it's a smart idea to move to the US and do research for us. So that when they complete their PhD they want to stay permanently and continue doing research that benefits the US. So that despite country humanity gets the smartest people together doing work that might benefit the entire world?

A full scholarship to somebody that decides to move back to their country because of racism and xenophobia still directly benefits the US if that research was done here. The smartest students in the world passing on the US does not help the US. With more policies like this the smartest students in the US might move to other countries so they can work with a larger pool.