PHILADELPHIA (CBS) — The US Supreme Court order allowing the Trump administration’s ban on travel from eight countries may be temporary, but its impact is immediate for thousands of immigrants.

Before the order, nationals from countries such as Iran, Libya, Somalia, Syria, Yemen, Chad, Venezuela and North Korea may have still been able to enter the US on qualified relationships with universities, employers or family members, but not anymore.

“Any such nationals who have plans to travel from the US or to the US should seek guidance before doing so,” said Golnaz Fakhimi.

Fakhimi is an immigrant rights attorney with the ACLU of Pennsylvania.

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He says nationals from affected countries who leave, may not be able to return so groups are providing legal advice.

“Reach out to organizations like the ACLU,” he said. “The next step is this is going back to the appellate court.”

Jacob Bender of CAIR Philadelphia says advocates will continue fighting, and notes full implementation of the travel ban is temporary.

“It removes restrictions on the ban until the court rules,” he said.

The ban will be the focus of oral arguments in the 9th and 4th Circuit Courts of Appeal this week, and court ruling could come soon after.