The Trump administration has transferred hundreds of immigrants to El Salvador even as a federal judge issued an order temporarily barring the deportations under an 18th century wartime declaration targeting Venezuelan gang members, officials said Sunday. Flights were in the air at the time of the ruling.

U.S. District Judge James E. Boasberg issued an order Saturday temporarily blocking the deportations, but lawyers told him there were already two planes with immigrants in the air — one headed for El Salvador, the other for Honduras. Boasberg verbally ordered the planes be turned around, but they apparently were not and he did not include the directive in his written order.

White House press secretary Karoline Leavitt, in a statement Sunday, responded to speculation about whether the administration was flouting court orders: "The administration did not 'refuse to comply' with a court order. The order, which had no lawful basis, was issued after terrorist TdA aliens had already been removed from U.S. territory."

The acronym refers to the Tren de Aragua gang, which Trump targeted in his unusual proclamation that was released Saturday

In a court filing Sunday, the Department of Justice, which has appealed Boasberg's decision, said it would not use the Trump proclamation he blocked for further deportations if his decision is not overturned.

Trump's allies were gleeful over the results.

"Oopsie — Too late," Salvadoran President Nayib Bukele, who agreed to house about 300 immigrants for a year at a cost of $6 million US in his country's prisons, wrote on the social media site X above an article about Boasberg's ruling. That post was recirculated by White House communications director Steven Cheung.

U.S. Secretary of State Marco Rubio, who negotiated an earlier deal with Bukele to house immigrants, posted on the site: "We sent over 250 alien enemy members of Tren de Aragua which El Salvador has agreed to hold in their very good jails at a fair price that will also save our taxpayer dollars."

The immigrants were deported after Trump's declaration of the Alien Enemies Act of 1798, which has been used only three times in U.S. history.

WATCH | Trump moves quickly on immigration raids, arrests: 

Trump moves quickly on immigration raids, arrests

U.S. President Donald Trump is quickly following through on his promise to crack down on illegal immigration with raids and deportation. Trump is now pushing for a massive increase in spending on border security and immigration reform.

The law, invoked during the War of 1812 and World Wars I and II, requires a president to declare the United States is at war, giving him extraordinary powers to detain or remove foreigners who otherwise would have protections under immigration or criminal laws. It was last used to justify the detention of Japanese-American civilians during World War II.

Venezuela's government in a statement Sunday rejected the use of Trump's declaration of the law, characterizing it as evocative of "the darkest episodes in human history, from slavery to the horror of the Nazi concentration camps."

Tren de Aragua originated in an infamously lawless prison in the central state of Aragua and accompanied an exodus of millions of Venezuelans, the overwhelming majority of whom were seeking better living conditions after their nation's economy came undone during the past decade. Trump seized on the gang during his campaign to paint misleading pictures of communities that he contended were "taken over" by what were actually a handful of lawbreakers.

The Trump administration has not identified the immigrants deported, provided any evidence they are in fact members of Tren de Aragua or that they committed any crimes in the United States. It also sent two top members of the Salvadoran MS-13 gang to El Salvador who had been arrested in the United States.

The deportees were taken to the notorious CECOT facility, the centrepiece of Bukele's push to pacify his once violence-wracked country through tough police measures and limits on basic rights.

Flurry of litigation

The Trump administration said the president actually signed the proclamation contending Tren de Aragua was invading the United States on Friday night but didn't announce it until Saturday afternoon. Immigration lawyers said that, late Friday, they noticed Venezuelans who otherwise couldn't be deported under immigration law being moved to Texas for deportation flights. They began to file lawsuits to halt the transfers.

The litigation that led to the hold on deportations was filed on behalf of five Venezuelans held in Texas who lawyers said were concerned they'd be falsely accused of being members of the gang. Once the act is invoked, they warned, Trump could simply declare anyone a Tren de Aragua member and remove them from the country.

Boasberg barred those Venezuelans' deportations Saturday morning when the suit was filed, but only broadened it to all people in federal custody who could be targeted by the act after his afternoon hearing. He noted that the law has never before been used outside of a congressionally declared war and that plaintiffs may successfully argue Trump exceeded his legal authority in invoking it.

The bar on deportations stands for up to 14 days and the immigrants will remain in federal custody during that time. Boasberg has scheduled a hearing Friday to hear additional arguments in the case.

He said he had to act because the immigrants whose deportations may actually violate the U.S. Constitution deserved a chance to have their pleas heard in court.

"Once they're out of the country," Boasberg said, "there's little I could do."