The winner will take office in January to replace corruption-tainted Jimmy Morales, who leaves with his popularity at rock bottom.
The country deployed 1,000 immigration agents in the north and south of Mexico amid heightened pressure from the US to reduce the surge of mostly Central American migrants through its territory
They accuse migrants and refugees of being messy, ungrateful and a danger to Tijuana, a narrative similar to US President Trump's. They complain the caravan forced its way into Mexico, calling it an "invasion."
Mexican authorities on Thursday had managed to block the "caravan" of migrants on a border bridge between Mexico and Guatemala, but many later entered via a river separating the two countries.
A group of women in Mexico have been donating food to Central Americans bound for the United States, saying they have no intentions to stop their work despite the changing political climate.
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