On July 2, U.S. District Judge Randolph Moss in Washington determined that Trump's denial of asylum to migrants on the southern border exceeded the president's authority.

He then certified a class that covered all individuals subject to the presidential proclamation on asylum and issued an injunction to protect the class -- effectively a nationwide injunction.

The administration appealed the ruling, which White House aide Stephen Miller called a judge's attempt to "circumvent" the Supreme Court’s ruling by recognizing "a protected global 'class' entitled to admission into the United States."

"I think there's going to be a lot more class actions," said Lee Gelernt, an attorney with the ACLU, which brought the asylum case.

Class actions must follow what is known as Rule 23, which requires the plaintiffs to meet several elements including proving that the proposed class members suffered the same injury. Conservative Supreme Court Justice Samuel Alito warned lower courts against certifying nationwide classes without "scrupulous adherence to the rigors of Rule 23.”

The process to certify a class can often take months. A senior White House official told Reuters the administration will be watching class certification decisions closely and plans to aggressively challenge them to prevent abuse of the process.

The government says the named class plaintiffs in the New Hampshire case are too different from one another to be able to proceed as a class action. They include an asylum seeker and someone on a student visa.
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