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The agreement with Nayib Bukele, the president of El Salvador, is undermining a long-running federal investigation into the gang, according to people familiar with the inquiry.

June 30, 2025, 5:03 a.m. ET
When Nayib Bukele, the president of El Salvador, agreed earlier this year to imprison deportees from the United States, he had a specific request of the Trump administration: the return of top MS-13 leaders in American custody.
For the past several months, a team of New York Times reporters has been investigating how their return is affecting President Trump’s pledge to dismantle the transnational gang and why Mr. Bukele would want top gang leaders back in his country.
Bukele could benefit from MS-13 leaders being let out of U.S. custody.
U.S. and Salvadoran officials have said MS-13 leaders are being returned to face justice in El Salvador. But The Times found that American prosecutors have amassed substantial evidence of a corrupt pact between the Salvadoran government and some high-ranking MS-13 leaders, who agreed to drive down violence and bolster Mr. Bukele politically in exchange for cash and perks in jail. Investigators had even begun scrutinizing Mr. Bukele himself.
Some who were part of the federal investigation worry that Mr. Bukele wants the gang leaders back to prevent them from revealing damaging information about his government.
The return of top MS-13 leaders could hamper the U.S. investigation.
The investigation began in the first Trump administration, spearheaded by a cross-agency group called Joint Task Force Vulcan. But now two major cases against some of the gang’s highest-ranking leaders that emerged from that effort could be badly damaged, and other defendants could be less likely to cooperate or testify in court, according to multiple people with knowledge of the initiative.
Prosecutors are quietly seeking to drop charges against top leaders.
After working for years to get senior MS-13 leaders into custody, federal prosecutors are now quietly dropping charges against them. One top leader, César López Larios, was put on a plane to El Salvador in March with other migrants sent to a maximum-security prison. Mr. López had been in U.S. custody for less than a year and was awaiting trial on narco-terrorism conspiracy charges.