South Dakota Gov. Kristi Noem, Donald Trump's pick to lead the agency central to his vision of cracking down on illegal immigration, faced senators Friday at confirmation hearing that will be her first chance to lay out her vision for the sprawling Department of Homeland Security.

President-elect Donald Trump's choice for Homeland Security secretary portrayed illegal immigration as an "invasion" and the U.S.-Mexico border as a "war zone" during a U.S. Senate confirmation on Friday where she pledged to back Trump's hard line on immigration.