Antisemitism watchdog groups are raising alarm over a graduate student and teaching assistant at Johns Hopkins University who threatened to fail Jewish students, while also making disparaging remarks about Israelis and white people.

“We find it alarming that a teaching assistant at a major university is expressing a clear intent to punish students on the basis of their race, Jewish identity or national origin as Israelis—all protected categories under state and federal non-discrimination laws,” Yael Lerman, director of the StandWithUs Saidoff Legal Department, said in a statement.

In November, the TA, who was identified by StopAntiSemitism.org as Rasha Anayah, at John Hopkin’s University’s Thor Research Group wrote a series of tweets where she not only threatened to fail pro-Israel students.

In one tweet, she asked: “Ethical dilemma: if you have to grade a zionist student exam, do you still give them all their points even though they support your ethnic cleansing? like idk.”