Airlines have started boarding onto U.S.-bound flights citizens of seven Muslim-majority countries after a federal judge Friday temporarily halted President Trump's travel ban against them, according to Saturday reports.

Federal Judge James Robart, appointed by former President George W. Bush in 2003, issued an immediate nationwide restraining order against Trump’s action, which had cut off citizens from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen from entering the U.S.

Qatar Airways was the first to say it would start boarding the passengers, Reuters reported. Air France, Spain's Iberia and Germany's Lufthansa have since joined.

U.S. Customs and Border Protection told airlines Friday it was "back to business as usual," saying passengers could be boarded within hours of Friday's ruling.

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An airline executive told CNN that CBP is "back to prior to the situation that was in place before last week's executive order.”

The ruling, made at the request of Washington and Minnesota, is the broadest to date against Trump's executive order.

Trump's action had banned citizens from the seven nations from entering the U.S. for 90 days. It also temporarily halts the United States' refugee resettlement program for 120 days, while indefinitely suspending resettlement for refugees from Syria.

The executive order, issued last Friday, immediately stirred controversy when travelers who were en route to the U.S. when it was signed were detained at airports. Protesters have demonstrated at airports across the county, and activists cheered Robart's ruling.

However, Trump on Saturday slammed the "so-called judge" behind the decision, vowing it would be overturned.