Harvard files complaint against Trump action blocking foreign students from attending the school

Harvard University is challenging President Trump's move to block foreign students from coming to the United States to attend the Ivy League school, calling it illegal retaliation for Harvard's rejection of White House demands.

In an amended complaint filed Thursday, Harvard called the president's action an end-run around a previous court order. Last month, a federal judge blocked the Department of Homeland Security from revoking Harvard's ability to host foreign students.

The filing attacks Trump's legal justification for the action — a federal law allowing him to block a "class of aliens" deemed detrimental to the nation's interests. Targeting only those who are coming to the U.S. to study at Harvard doesn't qualify as a "class of aliens," Harvard said in its filing.