MEXICO CITY — Mexico sent 26 people accused of being cartel operatives to the United States, Mexican officials announced on Tuesday, in an apparent bid to alleviate intense pressure from President Donald Trump to do more to combat the powerful groups smuggling fentanyl across the border.

The transfer is the second this year by Mexican officials, who sent 29 cartel leaders to the United States in February — a decision that sparked debate in Mexico over the legal grounds and political sense of such a gambit.

For months, Mexico has been under intense pressure from Trump, who has threatened high tariffs over issues including immigration and combating drug cartels. Although the Mexican government has worked hard to curb migration and has launched an aggressive campaign against the Sinaloa car

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