The number of migrants illegally crossing the U.S.-Mexico border has plummeted 40 percent since President Joe Biden clamped down on asylum earlier this month, administration officials said Wednesday. Daily crossings have fallen below 2,400. That’s the lowest level since Jan. 17, 2021, right before the president took office. But encounters still remain too high for the president’s newly implemented restrictions to be lifted: Migrants will continue to be barred from seeking asylum in between...