Sleeping on cardboard boxes or plastic bags, the migrants set up a massive, impromptu camp in the southern town of Huixtla, 70 kilometers (45 miles) from the Mexico-Guatemala border.
He was far from the only one moved to help the masses of women, men and children as they made their way on foot between the far southern Mexican towns of Mapastepec and Pijijiapan - a 30-mile trek.
Migrants are often kidnapped by people traffickers and drugs gangs who force them to work for them.
"The troops retain the right of self-defense, but border patrol officers will still be the ones physically stopping illegal migration", the report noted. "That's what the agency should have been working on all the way back in 2017".
He is also mobilizing the military along the border, and Secretary of State Mike Pompeo said Tuesday the caravan "will not cross the border under any circumstances". The wider region has one of the highest murder rates in the world. It called people to meet at 8 a.m. on October 12 at the San Pedro Sula bus terminal.
Unfortunately for people of these countries, poverty and violence are not something new.
The hot weather means sunburn and dehydration are a constant risk, and some of the migrants have attempted to protect themselves with umbrellas and pieces of cardboard. Their prime concern is the election - and that's a mere two weeks away. It appears someone or some organization is determined to make immigration an election-year issue. "That has spurred a new caravan, but this caravan is much larger". None would say who the organizers are but several said it was organized. And, "if the caravan stops, who wins?"
Asked if he was implying there were terrorists in the caravan, Trump said, "There could very well be". But the person leading/speaking for the caravan, Denis Omar Contreras, is a PSF organizer?
18 killed as Jordan flash flood sweeps away students on trip
Search teams had rescued 34 people, some of whom were in a serious condition, Jordanian civil defence sources said . State media report that Jordan's King Abdullah II has cancelled a trip to Bahrain to follow the rescue operations.
Trump tweeted: "Sadly, it looks like Mexico's Police and Military are unable to stop the Caravan heading to the Southern Border of the United States".
So that George Soros funding story? Both have denied any involvement.
Thousands of Central American migrants awoke Tuesday in a makeshift encampment in a rain-soaked town square in far-southern Mexico, some tired, foot-sore and coughing, still distant from their goal of reaching the US border.
The migrant caravan from Central America grows as it slowly moves toward the US; insight from Jessica Vaughan, director of policy studies at the Center for Immigration Studies.
But this strategy will likely backfire, similar to the strategy of trying to sink Brett Kavanaugh's Supreme Court nomination with uncorroborated claims.
There's a possibility some members will split off and try to make their own way to the US-Mexico border.
Associated Press journalists traveling with the caravan have met throngs of Hondurans, as well as Guatemalans, Salvadorans and Nicaraguans, but no one from the Mideast.
USA agents arrested almost 17,000 members of family units attempting to cross the US border with Mexico in September, a 31 percent increase over the previous month, according to official statistics released on Tuesday.
Grateful for the hospitality, numerous migrants have tried to be respectful visitors.
It was predictable, and it's happening: Another caravan is forming. It lays bare a fundamental question of USA politics.