"In a statement released on Sunday, Homeland Security Secretary Kirstjen Nielsen wrote that ""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."": AP Photo/Manuel Balce Ceneta  ""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.""  FOX  NEWS  Homeland Security Secretary Kirstjen Nielsen  chan neI In a statement released on Sunday, Homeland Security Secretary Kirstjen Nielsen wrote that ""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."""