Harvard University announced Thursday it is challenging the Trump administration’s ban on international students going there in court.

President Donald Trump issued an executive order on Wednesday denying visas for foreign students aiming to study at Harvard.

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“Singling out our institution for its enrollment of international students and its collaboration with other educational institutions around the world is yet another illegal step taken by the Administration to retaliate against Harvard,” Harvard President Alan Garber said in a letter to the campus community.

He added that “contingency plans are being developed to ensure that international students and scholars can continue to pursue their work at Harvard this summer and through the coming academic year” as the court considers their request.

The administration previously tried to revoke Harvard’s ability to enroll foreign students, but the effort failed after a judge blocked the move. Trump said Harvard did not provide enough information on its foreign students.

“Harvard provided data on misconduct by only three students, and the data it provided was so deficient that the DHS could not evaluate whether it should take further actions,” Trump said.

Trump’s proclamation said the president would “restrict the entry of foreign nationals who seek to enter the United States solely or principally to participate in a course of study at Harvard University or in an exchange visitor program hosted by Harvard University.”

Harvard’s amended complaint in its case against the Trump administration says the moves violate its First Amendment rights. “Each is part of a concerted and escalating campaign of retaliation by the government in clear retribution for Harvard’s exercising its First Amendment rights to reject the government’s demands to control Harvard’s governance, curriculum, and the ‘ideology’ of its faculty and students,” the amended complaint says.

“The government’s actions, moreover, have no basis in law,” it continued.

It adds that Trump’s actions amount to a personal vendetta against Harvard: “The President’s actions thus are not undertaken to protect the ‘interests of the United States,’ but instead to pursue a government vendetta against Harvard.”

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The federal government and the university have been feuding for months, with Harvard being one of the few to resist caving to the administration despite losing federal funding. The school lost billions of dollars as a result.

“The university will not surrender its independence or relinquish its constitutional rights,” the university said in a statement. “Neither Harvard nor any other private university can allow itself to be taken over by the federal government.”