The White House has not made a final decision on which countries will be invited to the forthcoming Summit of the Americas in Los Angeles, following warnings by Mexico’s president that he would skip the regional gathering next month if the authoritarian leaders of Cuba, Venezuela and Nicaragua are excluded. Mexican President Andrés Manuel López Obrador is not the only one threatening to boycott the largest gathering of leaders from the Western Hemisphere, which the U.S. will host for the first time since the inaugural Summit in Miami in 1994. Reuters reported that President Jair Bolsonaro of B…