Unlawful crossings at the U.S. southern border are down 94% from the same period last year, Border Patrol Chief Mike Banks told CBS News in his first sit-down interview, crediting the Trump administration’s government-wide crackdown on illegal immigration.

The U.S. Border Patrol arrested 29,000 migrants illegally crossing the U.S.-Mexico border in January, the agency said on Tuesday, signaling that a drop in crossings over the past year could continue under President Donald Trump.

U.S. authorities say arrests for illegal border crossings from Mexico plunged 39% in January, an early gauge of President Donald Trump’s immigration crackdown