Supporters of Homeland Security Secretary Alejandro Mayorkas says he brings a prosecutor’s tenacity and a personal understanding of the immigrant experience in America to the job of running the sprawling agency

To his supporters, Alejandro Mayorkas is a thoughtful, driven secretary who brings a prosecutor’s tenacity and his personal understanding of the immigrant experience in America to running his sprawling agency. To his detractors, he personifies everything that has gone wrong at the U.S.-Mexico border and is responsible for allowing hundreds of thousands of migrants into the United States illegally in a burgeoning crisis.

Mayorkas, often referred to as Ali, is the first Latino and the first immigrant to lead the Department of Homeland Security, one of the government’s biggest agencies with 260,000 employees. And if House Republicans get their way, he’ll also be the first Cabinet member impeached in nearly 150 years.