As the group of some 4,000 people from El Salvador, Guatemala and Honduras heads toward the US border with Mexico to seek asylum, Trump has called for stricter border enforcement, threatening to cut foreign aid to the three countries and possibly rip up trade deals.
The attack comes with Trump's Republicans fighting to retain control of Congress in the November 6 vote, and as thousands of migrants from impoverished Honduras were marching north through Guatemala toward the United States.
Mexican Ambassador to the United States Geronimo Gutierrez on Thursday said he was not aware of a deal between the United States and Mexico to stop the Honduran migrant "caravan" fleeing north to the United States' southern border.
Trump claimed that "Criminal elements and DRUGS [are] pouring in" and that it is "All Democrats [sic] fault for weak laws!" In press interviews, the immigrants are gaining widespread popularity for denouncing the inequality, corruption and state violence that plague all of Central America. Vox declared that "Trump's "caravan" tantrum could put migrants in danger".
A caravan of 3,000 migrants is moving north through Central America and toward the US southern border - on a collision course with the midterm elections, as yet another factor that could sway voters. Guatemalan troops are also said to be putting up resistance.
Mexican President-elect Andres Manuel Lopez Obrador, who takes office on December 1, wants to avoid repression against migrants and also avoid angering the United States.
"The position of President Trump is the one he has always raised, I do not see him as anything surprising, I would be surprised by a different position", Ebrard told local radio station Radio Centro.
"Hopefully Mexico will stop this onslaught at their Northern Border".
The president's message was part of a broad strategy to crack down on illegal immigrants and tighten rules for legal migrants. They eventually retreated to await the rest of the caravan.
"Whoever wants to work in our country is going to have support, is going to have a work visa", he said. "But it would have much less impact on illegal border crossings between ports of entry". Republicans seeking to retain control of the House of Representatives will likely present the migrant caravan as evidence of what they say is a need to further tighten the U.S. -Mexico border.
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It was the second time in six months that Trump suggested the possibility of military action to curb immigration at the U.S. -Mexico border.
More than 2,000 Hondurans are in a migrant caravan trying to reach the United States. "Anyone who wants to work in our country ... will have a work visa", he said.
The group chanted: 'We are not smugglers, we are migrants, ' as they reorganized themselves on Friday afternoon.
"Only God on high can stop us", Escobar said.
On Thursday, Trump branded the migrants an "onslaught" and an "assault on our country" in a series of typically fiery tweets.
On the new trade pact, some analysts don't think it's in any immediate danger.
It's finally Mexico's turn to deal with the problem. "They're frequently tricked by human smuggling organizations".
Still, it wasn't until this year that the caravans received widespread attention.
The first members of the group began arriving in Tecun Uman on buses and trucks early Thursday, but the bulk of the caravan sloshed into town on foot in a downpour late in the afternoon and into the evening.