Harvard University expanded its lawsuit Tuesday against the Trump administration for freezing billions of dollars in federal funds, ratcheting up the high-stakes legal battle between the wealthiest US university and the White House.

Harvard University expanded its lawsuit challenging the Trump administration's moves to cut off billions of dollars in federal funding to the Ivy League school on Tuesday after officials said they are terminating an additional $450 million in grants.

Harvard University is dedicating $250 million of its own funds to support researchers after U.S. President Donald Trump's administration froze nearly $3 billion in federal grants and contracts in recent weeks,