U.S. Vice President Kamala Harris will speak with Mexico’s president on May 7 about his proposal to expand a tree-planting program to Central America as a way to reduce migration and poverty, Mexico’s foreign minister said on Saturday.

Foreign Minister Marcelo Ebrard said in a tweet that the virtual meeting is set to include Mexico’s economy minister.

Mexican President Andres Manuel Lopez Obrador has suggested the U.S. government offer temporary work visas and eventually citizenship to those who take part in the tree-planting program.