Washington — In an exclusive interview with CBS News, U.S. Border Patrol chief Jason Owens called the situation at the southern border a "national security threat," expressing concern about tens of thousands of migrants who have evaded apprehension and entered the country surreptitiously over the past five months. Owens said Border Patrol is "closing in" on recording one million apprehensions of migrants in between ports of entry along the U.S.-Mexico border in the 2024 fiscal year, which started in October. For the third consecutive year, his agency is on track to record two million apprehensions by the time the fiscal...