The Trump administration is asking federal agencies to cancel contracts with Harvard University worth about $100 million, a senior administration official said Tuesday, intensifying the president’s clash with the nation’s oldest and wealthiest university, AP reported.

The government has already canceled more than $2.6 billion in federal research grants for the Ivy League school, which has pushed back on the administration’s demands for changes to several of its policies.

A draft letter from the General Services Administration directs agencies to review contracts with the university and seek alternate vendors. The administration planned to send a version of the letter on Tuesday, the official said. The official spoke on the condition of anonymity to describe internal deliberations.

The New York Times first reported on the letter.

President Donald Trump has railed against Harvard, calling it a hotbed of liberalism and antisemitism. The school filed a lawsuit on April 21 over the administration’s calls for changes to the university’s leadership, governance and admissions policies. Since then, the administration has slashed the school’s federal funding, moved to cut off enrollment of international students and threatened its tax-exempt status.