Soon after the Trump administration announced it was cutting billions of dollars in grants to Harvard University following a breakdown in discussions over antisemitism on campus, the Ivy League institution pulled out the biggest weapon in the federal legal arsenal: the First Amendment.

The president of Harvard on Wednesday defended the university’s decision to sue the Trump administration, adding that the institution “cannot compromise” on core principles like the First Amendment. Harvard took legal action against the Trump administration on Monday over the government’s decision to freeze over $2 billion in federal funding meant for the university after it refused to make the reforms it ordered.

Harvard University announced a lawsuit against the Trump administration Monday, following billions of dollars in federal funding cuts to the school.