Education Secretary Linda McMahon posted a harshly worded letter to Harvard on Monday saying the school must meet several criteria to receive new grants.

The freeze, which is expected to impact over $1 billion annually, will target research grants and will not affect Pell Grants or student loan funding.

The dispute between the Trump administration and Harvard centers primarily on the university’s diversity, equity and inclusion initiatives, commonly known as DEI programs. These institutional policies have become a focal point of disagreement between federal authorities and university leadership.