I won't make this long, but it's made me very nervous and I need some external advice. tl;dr is principal pressured me to go against district and university policy by acting as a substitute without the supervision of my cooperating teacher, and when I reported it to my professor who was rightfully angry and told the principal she couldn't do that, the principal reprimanded me the next day for 'not caring about the children' and is threatening to have me removed from student teaching, therefore causing me to fail this semester. My husband is irate and thinks I should sue or report her to the school board, but I don't even know if I have a leg to stand on. I don't want to get my cooperating teacher fired, either. This isn't the first time something like this has happened; she's also gotten angry at me for not teaching for every other teacher in my grade level, believing I wasn't getting the 'full teaching experience' unless I did. She's been hateful and aggressive towards me and my CT since the beginning of the year, but I really just want to graduate. What should I do?