President Donald Trump has made immigration a central focus of his agenda since the beginning with his border wall being a major component of that.
In the caravan, Central American migrants hiked from Honduras through muddy jungle and residential streets, some toting babies along with backpacks, Reuters images show.
On Thursday, Trump branded the migrant caravan an "onslaught" and an "assault on our country" in a series of typically fiery tweets.
Arpaio was specifically addressing the caravan of several thousand reportedly transiting through Central America and heading toward the US border.
Mexican authorities prepared to receive the migrants and determine who would get refugee status and who will be deported back to their country.
Illegal immigration is likely to be a top issue in November 6 US congressional elections and Trump said migrants in the caravan were being used by his political opponents.
Now, Scalise says that Trump was "clearly ribbing" Gianforte for the incident, claiming that "not one [Trump supporter] harassed the numerous media reporters who were present".
While Trump has threatened to deploy the military to the Mexico-U.S. border, Lt. Col. Jamie Davis said Thursday in a statement that the "Department of Defense has not been tasked to provide additional support".
"The president certainly can slow down crossing at legal border crossings where about a million people cross each day". "But it would have much less impact on illegal border crossings between ports of entry". Mexico seems to have gotten the message, and is sending hundreds of federal cops to try to stem the caravan.
Marcelo Ebrard, Lopez Obrador's pick to become foreign relations secretary after he takes office, said Trump's tweets needed to be understood in the context of the upcoming US midterm elections.
Hundreds of Mexican Federal Police sealed the border as drones and helicopters hovered above the crowd, which waited on a bridge in sweltering heat.
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Pompeo meets with Mexican officials as a migrant caravan inches north
Trump also informed that if necessary, he would deploy the usa military to its Southern border with Mexico to halt the migrants. In April , he said in a meeting with foreign leaders that the U.S.is "going to be guarding our border with our military".
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"They should be locking them up as they enter Mexico from these Central American countries".
He also said he aid could be cut to countries allowing the caravan to pass. On a bridge leading out of the Guatemalan capital, Hondurans marched single-file behind a woman holding a baby in her arms as a school bus rumbled past.
Many said they were making the journey for economic reasons.
"Only God on high can stop us", Escobar told the AP.
Trump did not detail his military threat. Early Thursday, he threatened to close the US border if Mexico let the migrants advance.
On the new trade pact, some analysts don't think it's in any immediate danger.
Mr. Pompeo said he and Mr. Videgaray spoke of the importance of stopping the caravan before it reaches the USA border.
After arriving at the tall, yellow metal fence Friday, some clambered atop it and on USA -donated military jeeps.
While Mr Trump has sent national guard troops to the border before, it is unclear what he means by shutting it down entirely, and whether that would affect businesses or people with legitimate visas.
Still, it wasn't until this year that the caravans received widespread attention.
The group of Salvadoreans, Hondurans and Guatemalans say they are fleeing violence and poverty.
Trump has made it clear to Mexico that he is monitoring its response.