A graduating student wears their hat, decorated with a statement of support for international students, during the 374th Commencement exercises at Harvard University in Cambridge, Mass., May 29, 2025. Brian Snyder/Reuters, FILE

Harvard University is calling President Donald Trump's proclamation to block foreign students from attending the university another "illegal retaliatory step."

"This is yet another illegal retaliatory step taken by the administration in violation of Harvard's First Amendment rights," Harvard said in a statement. "Harvard will continue to protect its international students."

Trump signed the proclamation on Wednesday afternoon, invoking the Immigration and Nationality Act to prohibit the entry of noncitizens from entering the U.S. to study at Harvard for at

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