5 Takeaways: Behind Trump’s Deal to Deport Migrants to El Salvador

President Trump’s deportation in March of more than 200 alleged gang members from Venezuela to a maximum-security prison in El Salvador has emerged as a flashpoint in his administration’s use of wartime powers to expel immigrants.

Lawyers for those deported say the March 15 operation circumvented due process and swept up those who are not gang members. The Supreme Court is now poised to weigh in on how the White House has sought to apply the Alien Enemies Act, which had previously only been invoked by presidents in time of war.

A team of reporters from The New York Times reviewed court filings and government documents and interviewed government officials and lawyers for deportees and their relatives to reconstruct how the United States secured the deal with El Salvador and seized on the law to supercharge its deportation efforts.

Here are five takeaways.

El Salvador’s president pressed the U.S. for assurances that the deportees had gang ties.

President Nayib Bukele of El Salvador has championed President Trump and his immigration agenda and publicly celebrated the arrival of the deportees from the United States. But behind the scenes, Mr. Bukele expressed concern about who the United States sent to be imprisoned in his new Terrorism Confinement Center, known as CECOT, according to according to people familiar with the situation and documents obtained by The New York Times.

During the negotiations, Mr. Bukele told U.S. officials he would take only what he described as “convicted criminals” from other countries. He made it clear that he did not want migrants from other nations whose only crime was being in the United States illegally.