Minnesota Attorney General Keith Ellison announced Tuesday his office is joining at least 20 other states and the city of San Francisco in lawsuits seeking to stop an executive order signed Monday by President Donald Trump that would end birthright citizenship,

Early Tuesday afternoon, Minnesota Attorney General Keith Ellison announced he, as well as the attorneys general of more than a dozen states — including Wisconsin — asked the United States Supreme Court to invalidate the order, block any actions taken to implement the order and ask for immediate relief to prevent the order from taking effect.

Minnesota Attorney General Keith Ellison sued to block Trump’s executive order ending birthright citizenship, joining counterparts in 21 other states in legal battles against a right they say is guaranteed by the Constitution and upheld by the Supreme Court.

Attorneys general from 18 states including Minnesota sued to block President Donald Trump’s move to end a decades-old immigration policy known as birthright citizenship guaranteeing that U.S.-born children are citizens regardless of their parents’ status.

The suit argues the Supreme Court has previously ruled that birthright citizenship extends to everyone born in the United States.