Department of Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE said Sunday that the agency is focused on rooting out potential criminal gang members who may seek to exploit a so-called "caravan" of Central American migrants seeking asylum in the U.S.

"While we closely monitor the caravan crisis, we must remain mindful of the transnational criminal organizations and other criminals that prey on the vulnerabilities of those undertaking the irregular migration journey," Nielsen said in a statement.

"We shall work with our partners in the region to investigate and prosecute to the fullest extent of the law all who seek to encourage and profit from irregular migration," she continued. "We fully support the efforts of Guatemala, Honduras and Mexico, as they seek to address this critical situation and ensure a safer and more secure region.” ­

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Thousands of Central Americans have made their way from Honduras, El Salvador and Guatemala toward Mexico and the U.S. in recent weeks as they flee violence and poverty in their home countries. Those migrants typically travel in large groups for safety.

Smaller groups crossing into Mexico were granted visitor permits or asylum this weekend, while roughly 2,000 other migrants swam or were ferried across a river at the Guatemala-Mexico border, or made their way across a bridge before reconnecting with the larger group, The Associated Press reported.

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, who has made a push for stricter immigration laws a hallmark of his campaign rallies and his Twitter page, has seized on the group of migrants in recent days and warned of the threat the caravan poses to the U.S. border.

He has wielded the caravan as a political bargaining tool, threatening to close down the U.S.-Mexico border if the group is not stopped, or to cut off aid to Honduras, Guatemala and El Salvador if those countries do not prevent their citizens from fleeing for the U.S.

The president highlighted a similar group of migrants traveling to the U.S. in April, using that group to rally support for his border wall and blame Democrats for congressional inaction on immigration laws, despite Republicans holding majorities in both chambers of Congress.

Immigration policy has been a point of contention within the administration, and was reportedly the subject behind an explosive argument between chief of staff John Kelly John Francis KellyMORE and national security adviser John Bolton last week.