When asked about Trump's tweets critical of the caravan and his vows to keep them out, they have generally responded that he should stop attacking them and said they would keep trying to reach the United States.
The additional troops are to provide what one official described as logistical support to the Border Patrol.
That is in addition to the National Guard troops sent earlier this year, although it is not yet clear whether the additional troops will also be National Guard or active duty military members, Martin reports.
KRGV's Christian von Preysing spoke with several property owners about the agency's efforts. And Trump, at rallies and on Twitter, has tried to paint the Democrats as pro-illegal immigration, even claiming, with no evidence, that Democrats had organized and paid for the caravan, which remains more than 1,000 miles from the USA border.
Trump previously said he would send the military to the border if Mexican authorities failed to stop the caravan, which they have.
Trump and Vice President Pence have argued that criminals and "Middle Easterners" among the migrants seek asylum.
Trump has been stoking fears about a caravan of migrants in Central America who are trying to make their way to the USA border.
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"This caravan can not come to the United States", Nielsen said.
In April, when another such caravan of migrants began making its way north through Mexico, he called for USA troops to step in, suggesting that he wanted active-duty armed troops to do what immigration authorities could not. "Go back to your Country and if you want, apply for citizenship like millions of others are doing!" tweeted Trump. Many are fleeing violence, poverty and government corruption in their home countries.
There are now 2,100 National Guardsmen along the border, but the DHS request could lead to the first large-scale deployment of active-duty US military forces to support the border protection mission under Trump.
A White House official said, "The administration is considering a wide range of administrative, legal and legislative options to address the Democrat-created crisis of mass illegal immigration".
But Nielsen warned: "This caravan can not come to the United States".
Taken together, the actions would effectively prevent hundreds of people in the caravan from gaining entry into the United States and making an asylum claim. So far, only a little over 2,000 have been used.