By ELLIOT SPAGAT SAN DIEGO (AP) — Arrests for illegally crossing the border from Mexico fell 7% in September to a more than four-year low, authorities said Tuesday. It was likely the last monthly gauge during a presidential campaign in which Republican nominee Donald Trump has made immigration a signature issue. The Border Patrol made 53,858 arrests, down from 58,009 in August and the lowest tally since August 2020, when arrests totaled 47,283, according to U.S.