The coalition is backing the child plaintiffs in Barbara v. Trump, the case now before the justices testing the validity of the order Trump issued on his first day in office in 2025.
"The President's executive order redefining birthright citizenship violates our Constitution, federal statutes, and the rule that has governed our Nation for more than 150 years," the attorneys general said in a joint statement.
"We were proud to lead the fight against this unlawful order, and grateful for the injunctions we obtained that prevented this action from ever taking effect," they added. "We are optimistic the U.S. Supreme Court will agree with every judge to consider this executive order on the merits and hold that it violates this fundamental constitutional right."
According to the Connecticut AG's office, state coalitions filed two challenges to the order — one in the Western District of Washington and one in the District of Massachusetts — and obtained nationwide preliminary injunctions blocking the order from taking effect.
The release points to the Fourteenth Amendment, adopted in 1868, and Section 1401 of the Immigration and Nationality Act. It notes that Congress codified birthright citizenship into law twice, "first in 1940 and then again in 1952."
The statement said that if the order is allowed to stand, "thousands of babies born each year who otherwise would have been citizens will no longer enjoy the privileges and benefits of citizenship."
Tong, born in Hartford in 1973, "became the first United States citizen in his immediate family by right of his birth on American soil," according to the release.
Joining the statement were the attorneys general of Arizona, California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nevada, New Jersey, New Mexico, New York, North Carolina, Oregon, Rhode Island, Vermont, Virginia, Washington, Wisconsin and the District of Columbia.