CHICAGO, IL. — Attorney General Lisa Madigan is suing the operators of Chicago’s Trump Tower for violating federal environmental laws.

The lawsuit claims the building sucks about 20 million gallons of water out of the Chicago River and returns the same amount 35 degrees hotter. The water is used to cool heating, ventilation, and air conditioning systems in the building.

In a statement, Madigan said the water is taken without a permit and without any regard to how its return may impact the river’s ecosystem.

Trump Tower officials say the lawsuit “was motivated by politics.”