In the latest twist on a key Trump administration immigration policy, a federal appeals court said it will prevent the government from making asylum-seekers wait in Mexico for U.S. court hearings starting next week unless the Supreme Court steps in sooner.

The 9th U.S. Circuit Court of Appeals in San Francisco said Wednesday that it would only block the “Remain in Mexico” policy in Arizona and California, the two border states under its authority.

President Donald Trump’s administration says it is asking the U.S. Supreme Court to intervene and had asked that the policy remain in effect until next week to give the high court time to decide. The Supreme Court has consistently ruled in the administration’s favor on questions of immigration and border enforcement.

The latest turn in the case comes after the 9th Circuit halted the policy along the entire southern border on Friday but suspended its own order later that day after the government warned of dire consequences. “Remain in Mexico” is a crucial part of the Trump administration’s response to large numbers of asylum-seekers appearing at the border.

On Wednesday, the court ruled that the policy will no longer be in effect on Mexico’s border with California and Arizona starting March 12 unless the Supreme Court wades in sooner. It declined to extend its order to federal courts in the two other southern border states ? New Mexico and Texas.

Judges William Fletcher and Richard Paez, both appointed by President Bill Clinton, said they acknowledged that nationwide orders applied to places outside a court’s jurisdiction are “a matter of intense and active controversy.”

They reaffirmed their view that the policy, known officially as “Migrant Protection Protocols,” is illegal under U.S. law to prevent sending people to countries where their lives or freedom would be threatened because of their race, religion, nationality, political beliefs or membership in a particular social group.