The 4th US Circuit Court of Appeals today will examine a ruling that blocks the administration from temporarily barring new visas for citizens of Iran, Libya, Somalia, Sudan, Syria and Yemen.
It's the first time an appeals court will hear arguments on the revised travel ban, which is likely destined for the US Supreme Court.
Pointing to the Republican's promises on the campaign trail to bar Muslims from entering the country, a federal judge in Maryland found in March that the policy appeared to be driven primarily by religious animus.
"The court should have focused on official acts, not perceived subjective motivations," the attorneys say in court documents.
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The American Civil Liberties Union and National Immigration Law Center say Trump wants the courts to "blind themselves to the ample, public, and uncontested evidence" that the policy targets Muslims.
"The basic question in this case is whether the mountain of evidence that exists as to the improper motive is going to be looked at by this court or swept under the rug," said Omar Jadwat, director of the ACLU's Immigrants' Rights Project, who will argue the case today.
While the 4th Circuit was long considered one of the most conservative appeals courts in the country, it moved to the center under President Barack Obama, who appointed six of the 15 active judges.
The court said that two Republican-appointed judges Judge Allyson K Duncan and Judge J Harvie Wilkinson III won't hear the case.
Wilkinson's daughter is married to Acting Solicitor General Jeffrey B Wall, who's arguing on behalf of Trump. It was not immediately clear why Duncan is not on the panel.
The court typically takes weeks after holding arguments to issue a written decision. And even if the court sides with Trump, the travel ban will remain blocked unless the president also wins in another appeals court.
A federal judge in Hawaii has also blocked the six- country travel ban as well as the freeze on the US refugee program. A three-judge panel of the 9th US Circuit Court of Appeals will meet next today to hear arguments in that case.