The number of migrants unlawfully crossing the U.S. southern border has continued to drop markedly in July, nearing a threshold that would require officials to lift a partial ban on asylum claims enacted by President Biden, according to internal government data obtained by CBS News. July is on track to see the fifth consecutive monthly drop in migrant apprehensions along the U.S.-Mexico border and the lowest level in illegal immigration there since the fall of 2020, during the Trump administration, the internal Department of Homeland Security figures show. In early June, President Biden invoked a far-reaching presidential authority to suspend the entry of most migrants entering the U.S. illegally, effectively shutting off access to the American asylum system outside of official ports of entry.