(CNN) US President Donald Trump has pointed to a caravan of migrants trekking north through Mexico as a major issue in the upcoming midterm elections.

But when Election Day rolls around on November 6, the caravan could still be somewhere in the middle of Mexico, depending on the group's location, how fast it's been traveling and how long it's taken other groups of migrants to cross the country.

Early Saturday morning, the caravan of thousands set out from Arriaga, Mexico, about 170 miles from the Mexico-Guatemala border, where many of the caravan's members skirted authorities a week ago and crossed in rafts.

It's still too soon to know exactly where along the vast US-Mexico border the bulk of this caravan will travel.

But at the moment, they're heading west. After a vote Thursday night, members of the group decided to march toward Mexico's Oaxaca state rather than crossing to the eastern part of the country.