Washington • Plaintiffs led by the American Civil Liberties Union filed suit against the Trump administration in U.S. District Court in San Francisco on Tuesday in an attempt to halt the implementation of a new policy disqualifying most asylum seekers who pass through Mexico before reaching the United States.

The attorneys suing the government argued in their complaint that the Trump administration lacks the authority to exclude asylum seekers who arrive across the U.S. southern border because U.S. immigration law states clearly that the government cannot disqualify applicants on the basis of how they arrived.

"As part of our nation's commitment to the protection of people fleeing persecution and consistent with our international obligations, it is long-standing federal law that merely transiting through a third country is not a basis to categorically deny asylum to refugees who arrive at our shores," the complaint states.

A separate petition seeking an injunction against the asylum change was filed by two other immigrant rights groups in the U.S. District Court in Washington on Tuesday evening.

The lawsuits came just hours after the Justice and Homeland Security departments published an "interim final rule" in the Federal Register that aims to severely restrict the ability of asylum seekers to qualify for safe haven in the United States if they failed to request protections in other nations while en route to the border.

Attorney General William Barr said in a statement Monday that those who are truly facing persecution should apply for refuge in the first safe place they reach, not the most desirable destination. He likened the surge of asylum claims at the U.S. southern border to "forum shopping" by applicants attempting to exploit American generosity.

Trump administration officials said the policy decree was needed to shore up the overburdened U.S. asylum system from a flood of meritless claims by migrants who are seeking better economic opportunity but do not face actual persecution.

Justice Department data shows that asylum filings have nearly quadrupled in the past five years and that fewer than 20 percent of Central American applicants are eventually granted protections by U.S. courts.

The ACLU and others seeking to block implementation of the restrictions allege that the Trump administration violated federal rulemaking procedures in formulating them, and that the Immigration and Nationality Act states clearly that once applicants reach U.S. soil, they have a right to appeal for protection.

Lee Gelernt, the ACLU attorney who has led the group's legal challenges to Trump executive action on immigration, called it "the Trump administration's most extreme run at an asylum ban yet."

"It clearly violates domestic and international law, and cannot stand," Gelernt said in a statement.

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The Southern Poverty Law Center, the Center for Constitutional Rights and others joined the ACLU in seeking the injunction in the U.S. District Court for the Northern District of California. The court is within the jurisdiction of the U.S. Court of Appeals for the 9th Circuit, which has been the forum for nearly all of the major immigration litigation challenging Trump.

The court has a reputation as the country's most liberal, and administration officials say the ACLU and its fellow plaintiffs are practicing their own version of "forum shopping" by reliably suing in California.

In the Washington lawsuit, the plaintiffs, Capital Area Immigrants' Rights Coalition and Refugee and Immigrant Center for Education and Legal Services, Inc., said the new rule "creates a new third country-related exception to the (act's) presumption of asylum eligibility for those in the United States."

As of Tuesday afternoon, it was unclear whether the government had begun denying asylum at the border under the new rule.

The change potentially allows the government to deport those who request asylum back to their home countries if they declined to appeal for safe harbor in Mexico or another transit nation. The rule includes exceptions for trafficking victims and those denied refuge by other governments.