"Some of the members of the group said they hoped to make it to the U.S. border before elections are held in November, because they fear that if Donald Trump wins, he will follow through on a promise to close the border to asylum-seekers."
https://www.bbc.com/news/world-latin-america-67818686
https://apnews.com/article/mexico-migrants-us-border-ff6ec67feee12c38e3bcdc1cd34af90f
https://www.nbcnews.com/news/world/migrant-caravan-mexico-us-border-buses-trains-rcna162996
https://www.bbc.com/news/world-latin-america-67818686
https://apnews.com/article/mexico-migrants-us-border-ff6ec67feee12c38e3bcdc1cd34af90f
https://www.nbcnews.com/news/world/migrant-caravan-mexico-us-border-buses-trains-rcna162996