BOSTON (AP) — A federal judge in Boston said on Friday he would take under advisement a request from 18 state attorneys general to block President Donald Trump’s executive order ending birthright citizenship for the children of parents who are in the U.S. illegally.

U.S. District Judge Leo Sorokin was the third federal judge this week to hear arguments in lawsuits seeking to block the order. It was unclear when Sorokin, who was appointed by former President Barack Obama, would issue a decision on the request but it was not expected to come Friday.

The state attorneys general, along with the cities of San Francisco and Washington, asked Sorokin to issue a preliminary injunction.

“Millions of Americans who were born to immigrant parents and hundreds of millions can trace their citizenship back to immigrant ancestors — ancestors who built our country and fueled our economy under the protections of the 14th Amendment of the United States Constitution,” Massachusetts Attorney General Andrea Campbell, joined by attorneys general from Connecticut and New Jersey, told reporters ahead of the hearing. “The president cannot change the Constitution with a sharpie or a sham executive order.”

Two other federal judges blocked Trump’s order earlier in the week — first in Maryland, where a judge issued a nationwide pause on the order in a lawsuit brought by immigrant-rights advocacy groups and a handful of expectant mothers; and then in Seattle, where a judge in a separate lawsuit decried what he described as the administration’s treatment of the Constitution, saying Trump was trying to change it with an executive order.

Another challenge, brought by the American Civil Liberties Union, goes before a federal judge in New Hampshire on Monday.

In the Boston case, plaintiffs argue that the principle of birthright citizenship is “enshrined in the Constitution” and that Trump does not have the authority to issue the order, which they called a “flagrantly unlawful attempt to strip hundreds of thousands of American-born children of their citizenship based on their parentage.”

They also say Trump’s order would cost states funding they rely on to “provide essential services” — from foster care to health care for low-income children to “early interventions for infants, toddlers, and students with disabilities.”

“This is a case about children born in the United States,” Shankar Duraiswamy, the deputy solicitor general for New Jersey, told the court.