Mexican President Andrés Manuel López Obrador confirmed Monday that he will skip the Summit of the Americas in Los Angeles, dealing a blow to the U.S.′ efforts to rally governments to work together to address surging migration in the hemisphere. López Obrador had been leading a chorus of mostly leftist leaders pushing the U.S. to invite Cuba, Nicaragua and Venezuela to the gathering taking place on U.S. soil for the first time since 1994. Other leaders, including from Guatemala, Honduras and El Salvador — three big drivers of migration to the U.S. — have indicated they’ll stay away too. “There cannot be an Americas Summit if not all of the continent’s countries participate,” López Obrador said Monday, indicating that Mexico would instead be represented by his foreign affairs secretary, Marcelo Ebrard, “Or there can be one, but that is to continue with the old politics of interventionism.” The White House defended its decision to exclude certain countries, while also confirming López Obrador will visit Washington in July to meet with Biden. Press secretary Karine Jean-Pierre said there was “candid engagement” with the Mexican leader about the summit.