I have been working on my PhD program for five years. I have several journal publications and attended many academic conferences. For those previous graduated students from this lab, I have never seen they had that many publications as mine. Since I am an international student, my adviser likes to threaten I cannot graduate if I don't finish something, but this 'something' never has an end list. Once I finished this work, there will be another work coming up and the same threaten comes out from his mouth and emails again. Because my defense is coming up, I am really afraid he won't let me to defense. If this is the case, I will loss my F1 status because my I-20 is expired. I think this is unfair to me because my adviser abuse my F1 status. Should I sue he in any possible means?