In a migrant shelter in the southern Mexican city of Tenosique, near the Guatemalan border, a refugee from Honduras says he originally planned to move to the United States with his family.
The president devoted one tweet to an explicit attempt to connect the caravan and the midterm election campaign, urging people to "think of and blame the Democrats" if they see a caravan or an attempt at illegal immigration.
Immigration is expected to play a role in the midterm elections, with Republicans heavily pushing the issue.
Central American migrants walking to the United States start their day departing Ciudad Hidalgo, Mexico, Oct. 21, 2018.
The migrants began to leave the southern city of Tapachula under a burning sun Monday afternoon, bound for Huixtla about 25 miles (40 kilometers) away.
The caravan also highlights Democrats' "very extreme" stances on immigration and the border, said McDaniel.
Speaking to media at the White House on Tuesday, Trump said that the US was giving "hundreds of millions of dollars" to these three nations.
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By next year, those sums were projected to fall to $69.4 million for Guatemala, $65.8 million for Honduras, and $45.7 million in the case of El Salvador.
Despite Mexican efforts to stop them at the Guatemala-Mexico border, about 5,000 Central American migrants resumed their advance toward the US border Sunday in southern Mexico.
After stopping a group of migrants who tried to enter Mexico on Friday, Mexican authorities said they would willingly permit migrants to enter the country if they had the required documents and visas or were applying for asylum.
The majority of migrants say they are fleeing violence, political instability, and the poor economic conditions of their native homelands. Trump previously deployed the National Guard to the border in April, as a smaller caravan headed to the USA, but said over the weekend that he would deploy "the military, not the guard".
Ana Luisa Espana, a clothes washer and ironer from Chiquimula, Guatemala, joined the caravan as she saw it pass through Guatemala.
The caravan reached Mexico over the weekend and President Donald Trump had hoped Mexican authorities would control the group and prevent their journey. And he adds, "As far as I know there are no terrorists in these four countries, at least beyond the corrupt governments". White House officials could not immediately provide details.
As of Sunday (Monday NZT), the caravan of migrants from Central America had grown to roughly 5000 people, a group that stretched along the main highway in Tapachula, Mexico, for more than a kilometre.
Others lay exhausted in the open air, with only thin sheets of plastic to protect them from ground soggy from an intense evening shower, while some had no plastic at all.