TAPACHULA, Mexico — Mexico and El Salvador signed a cooperation agreement Thursday that includes a $30 million Mexican donation for reforestation in the Central American nation, amid increased pressure from the United States to slow a surge of migrants.

The project to reforest some 124,000 acres, with the expected creation of 20,000 jobs, was presented as Salvadoran President Nayib Bukele met his counterpart Andres Manuel Lopez Obrador in southern Mexico.

The meeting came as Mexico is putting into effect a deal on immigration reached with Washington to head off stiff tariffs President Donald Trump threatened to slap on all imports from Mexico.