Current and former federal senior law enforcement officials have warned of a possible “violent pushback” from Mexican cartels infuriated by President Donald Trump’s immigration crackdown for how it will curb their human smuggling incomes.

On Monday, a suspected Mexican cartel gunman opened fire at Border Patrol agents stationed in the Rio Grande Valley of South Texas. Experts on border security who have decades of experience working in this area told the Washington Examiner that the incident serves as a warning shot and was no accident.