A federal judge has temporarily blocked President Donald Trump’s executive order ending the constitutional guarantee of birthright citizenship regardless of the parents’ immigration status.

Multiple states and cities are suing President Donald Trump over his executive order ending birthright citizenship. Their argument is that a person born in the United States is a citizen of the United States and is protected under the 14th Amendment to the Constitution.

A federal judge Thursday blocked President Donald Trump’s executive order outlawing birthright citizenship—the policy automatically giving citizenship to anyone born in the U.S.—and declared it “blatantly unconstitutional,