From targeting more than $2 billion in grants to seeking to block foreign students from being enrolled or entering the country, President Donald Trump's administration has taken a number of actions against Harvard University.
The school, one of the most prestigious in the U.S., calls it an "escalating campaign of retaliation."
Here is a timeline of actions taken by the Trump administration targeting the university.
The Trump administration sends a letter to Harvard's president saying that the school has "failed to live up to both the intellectual and civil rights conditions that justify federal investment" and demanding that the university change its governance, adopt merit-based hiring, shutter any DEI programs and allow "audits" to ensure "viewpoint diversity."
After Harvard refuses to comply with the Trump administration's demands, the administration responds by freezing more than $2.2 billion in grants and $60 million in contracts to the school.
Trump posts on Truth Social that "Harvard should lose its Tax-Exempt Status."
U.S. Department of Homeland Security Secretary Kristi Noem sends a letter to Harvard demanding information on every international student with an F1 visa, warning that failing to comply with the request will result in the withdrawal of the school's Student and Exchange Visitor Program certification.
DHS also cancels two grants to Harvard totaling $2.7 million.
Harvard files a lawsuit against the Trump administration over the funding freeze.
MORE: Trump administration bars Harvard from enrolling international studentsHarvard says it has given DHS "thousands of data points concerning its entire F-1 visa student population."
U.S. Secretary of Education Linda McMahon says that Harvard will no longer receive any grants from the federal government.
Harvard says it has begun to receive grant termination notices from the federal government, including from the National Institutes of Health.
DHS tells Harvard that the school's initial production of information on its international students is insufficient, and asks for more details. Harvard redoes its search and produces more information for DHS.
The U.S. Department of Agriculture terminates its grants with Harvard.
MORE: Trump to push for end to all federal agencies' Harvard contractsThe U.S. Department of Energy, the Department of Defense, the National Science Foundation, and the Department of Housing and Urban Development all cancel their grants with Harvard.
Harvard amends its lawsuit against the Trump administration to cover additional funding cuts. A hearing in the case is set for July.
Noem says she has ordered the cancellation of Harvard's Student and Exchange Visitor Program certification, which would bar the school from enrolling foreign students.
Harvard sues the Trump administration over its attempt to cancel its Student and Exchange Visitor Program certification, and U.S. District Judge Allison Dale Burroughs grants a temporary order blocking the move.
MORE: Judge temporarily blocks Trump's move to bar Harvard from enrolling international studentsTrump, in a social media post, demands a list of the names of international students enrolled at Harvard.
The Trump administration asks federal agencies to "identify any contracts with Harvard, and whether they can be canceled or redirected elsewhere," according to a senior administration official.
The development comes as Judge Burroughs sets a May 29 hearing to consider extending his order barring the Trump administration from revoking the Harvard's Student and Exchange Visitor Program certification.
Ahead of a federal court hearing on the Trump administration pulling Harvard's ability to enroll international students through the Student and Exchange Visitor Program (SEVP), the administration backtracks, giving Harvard 30 days to challenge the revocation.
Trump signs a proclamation blocking foreign students from entering the U.S. to attend Harvard.
Trump invokes the Immigration and Nationality Act to prohibit the entry of noncitizens from entering the U.S. to study at Harvard for at least six months, arguing the institution is "no longer a trustworthy steward" of international students.
The proclamation also directs the secretary of state to consider revoking the visas of foreign students already in the U.S. to study at Harvard.
U.S. District Judge Allison Burroughs issues a temporary restraining order barring Trump from implementing the proclamation, after Harvard argues the move violates its First Amendment rights and is outside the authority of the executive branch.
The judge extends the temporary block on Trump's move to bar foreign Harvard students from entering the country.