Pennsylvania joined over 20 other states last week in filing a lawsuit challenging President Donald Trump’s new 15 percent global tariffs. The president imposed the tariffs the day after the U.S. Supreme Court’s 6-3 decision last month striking down the import taxes he put in place over the last year on the basis that the International Emergency Economic Powers Act, or IEEPA.

The president has said he believes tariffs are essential to reduce America’s longstanding trade deficits, and the 15 percent duties are being imposed under Section 122 of the Trade Act of 1974.

Section 122, which has never been invoked, gives the president temporary authority to address balance-of-payments deficits or declines in the value of the U.S. dollar and is not designed to exceed 150 days.  The lawsuit argues that the president can’t pivot to Section 122 because it was intended to be used only in specific, limited circumstances — not for sweeping import taxes. It also contends the tariffs will drive up costs for states, businesses, and consumers.

In addition to Gov. Josh Shapiro and Gov. Andy Beshear of Kentucky, also joining the lawsuit are the attorneys general of Colorado, Connecticut, Delaware, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nevada, New Jersey, New Mexico, North Carolina, Rhode Island, Vermont, Virginia, Washington, and Wisconsin.

The full complaint is available here.