Lopez Obrador also suggested the US and Mexico draft a development plan backed by public funds and invite Central American countries to join, with the aim of making it "economically unnecessary" for Central Americans to migrate.
Alfonso Durazo, proposed as the new administration's public security minister, said the amnesty law would be part of a 'Mexican recipe for peace.' Amnesty would not be given at the discretion of the president, he said.
Jose Antonio Meade, the candidate of the ruling centrist Institutional Revolutionary Party, or PRI, conceded defeat to Lopez Obrador, a 64-year-old former Mexico City mayor, within minutes of the polls closing.
An early count projection from the state's electoral institute said PRI candidate Alfredo del Mazo's lead would widen to between 32.75 per cent and 33.59 per cent of the vote. Delfina Gomez, candidate of MORENA was seen taking no more than 31.53 per cent.
Overdose deaths from opioids have increased almost six-fold in past two decades in the United States, according to the Centers for Disease Control and Prevention. The year 2017 witnessed more than 15,000 deaths due to heroin overdose.