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The Trump administration has prohibited Harvard University from admitting international students, marking a significant intensification in its actions against one of America’s revered Ivy League institutions.

Kristi Noem, the Secretary of Homeland Security, dispatched a letter to Harvard on Thursday, informing the administration that the university’s certification for the student and exchange visitor program had been rescinded, “effective immediately”.

This move is part of a broader crackdown in recent months by US President Donald Trump on elite institutions accused of advancing “woke” ideologies and not adequately addressing antisemitism.

In a post on X that published her letter, Noem wrote: “It is a privilege, not a right, for universities to enrol foreign students and benefit from their higher tuition payments to help pad their multibillion-dollar endowments.

“Let this serve as a warning to all universities and academic institutions across the country.”

The move would affect the admission of students for the coming academic year, but Noem also said the ban meant Harvard’s almost 6,800 existing international students, representing more than 27 per cent of this year’s intake, must switch their enrolment to other universities.

Harvard said the administration’s move was “unlawful” and that it was “fully committed” to maintaining its ability to host international students.

“We are working quickly to provide guidance and support to members of our community. This retaliatory action threatens serious harm to the Harvard community and our country, and undermines Harvard’s academic and research mission.”

The new attack on Harvard comes amid an escalating confrontation between Ivy League schools and the Trump administration, which has slashed billions of dollars of federal funding for the institutions.

Critics of the president say the moves against US universities amount to a crackdown on free speech and academic freedom. Harvard has sued the administration for halting more than $2bn in funding to it.

Noem accused Harvard of creating a “hostile” environment for Jewish students — an attack levelled by the administration against universities that were the scene of pro-Palestinian protests after Hamas’s October 7 2023 assault on Israel and the country’s subsequent offensive in Gaza.

The homeland security secretary said the Trump administration would seek all records of foreign students’ illegal, dangerous or violent activity, including instances of students making threats or disciplinary action taken against them.

The bar on international students will also spark concern for the 1.1mn foreigners enrolled in American universities — of whom the largest share come from India and China — as well as others hoping to study in the US.

Foreign students’ fees are a significant source of financial support for US universities.

Noem demanded last month that Harvard submit detailed records on its foreign students or be stripped of its right to enrol them. Harvard said at the time that it would “comply with the law and expect the administration to do the same”.

Will Creeley, legal director of the Foundation for Individual Rights and Expression, which has in the past criticised Harvard over free speech, called Noem’s action “retaliatory and unlawful”.

He said: “Little is more un-American than a federal bureaucrat demanding that a private university demonstrate its ideological fealty to the government under pain of punishment.”