 Arrests for illegal border crossings have dropped more than 40% during the three weeks that the asylum processing has been suspended, according to the Homeland Security Department. Wednesday's announcement came a day ahead of President Joe Biden's debate with presumptive presidential nominee Donald Trump, who brought up the border several times. Homeland Security Secretary Alejandro Mayorkas visited the Tucson, Arizona sector this week, the busiest corridor for illegal crossings during much of the last year.