By REBECCA SANTANA, Associated Press WASHINGTON (AP) — In the waning days of the Biden administration, Homeland Security Secretary Alejandro Mayorkas defended his agency’s work to tamp down border-crossing numbers and argued against breaking apart the sprawling department in a wide-ranging interview with The Associated Press. President-elect Donald Trump, who promised an aggressive Day 1 effort to stop illegal immigration and remove people in the country illegally, has chosen South Dakota Gov.