Thousands of Central American migrants are heading towards the U.S. border on foot. And President Trump is lashing out. “You have some very, very bad people in the caravan. You have some very tough criminal elements within the caravan. But I will seal off the border before they come into this country.” Trump is putting pressure on Mexico to halt the so-called caravan. Migrants were stopped at the Mexico-Guatemala border so they could be processed individually. But many kept going north. Most of the migrants are from Honduras and say they are fleeing economic hardship and violence. Caravans, like this one, have been organized by advocacy groups to help give migrants safety in numbers. In the past, caravans were just a few hundred people. But this one is the largest on record. Trump has seized on the issue, just in time for the midterm elections, tweeting: “Blame the Democrats for not giving us the votes to change our pathetic immigration laws. Remember the midterms.”