Central American migrants traveling in a caravan broke through a Guatemalan border fence Friday, running into a wall of police in Mexico, whose government has promised the United States it will confront the caravan.
Frustrated by Congress' failure to fully fund his proposed wall at the border with Mexico, Trump in April ordered National Guard personnel to help the Department of Homeland Security secure the border in four southwestern USA states.
If Trump pulls out of the trade deal or closes the border, there would be major economic implications for both countries.
The president's warning echoes an earlier tweet on Wednesday, in which he again blasted Democrats for refusing to approve tighter border control and immigration laws.
Migrants in a mass caravan are chanting that "one way or another, we will pass" as they move toward a bridge on the Guatemala-Mexico border.
Mexico's government says migrants with proper documents can enter Mexico and those who don't either have to apply for refugee status or face deportation.
The migrants say they organized for the long and hard journey on social media, but Washington suspects the group has been organized as a deliberate provocation. "Anyone who wants to work in our country will have help, will have a work visa", he pledged.
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On Twitter , Trump said he wanted "Mexico to stop this onslaught ", or he will use the military to "CLOSE OUR SOUTHERN BORDER". But there are still many unanswered questions about how this will actually play out once large numbers of migrants arrive.
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Mexico's southern border is notoriously porous and it was unclear how numerous migrants would attempt to cross legally at the bridge.
The U.S. -Mexico border between Tijuana and San Diego is the world's busiest land border crossing.
"Mexico also issued a very clear statement saying if somebody is seeking asylum, Mexico is there along now with the U.N.to look at those claims, we want to make sure those claims are legitimate".
Mexico's incoming foreign minister, Marcelo Ebrard, told local radio that he was not surprised by Trump's comments, and said it was political. He also suggested they are ready to welcome the migrants with open arms because they are likely to vote for them in elections.
In Guatemala City, where migrant shelters filled with people, waves of people departed at daybreak on roads leading to Mexico.
The latest on the caravan of Central American migrants trying to advance toward the United States.
Mexico's president, Enrique Peña Nieto, is also hosting emergency talks with the U.S. secretary of state, Mike Pompeo, on Friday, to assess the situation.
Under pressure from the United States to stop the migrants, Mexico has sent federal police to the border, though they are not officially there to stop the caravan. Vox declared that "Trump's "caravan" tantrum could put migrants in danger".