Campaign officials are weighing a potential visit by Vice President Kamala Harris to the US-Mexico border while in Arizona on Friday as the campaign tries to close the gap with former President Donald Trump on the issue of immigration, according to two sources familiar with the discussions. Immigration has featured prominently in the 2024 presidential election. Democrats, grappling with years of border crises, have tried to flip the script on Republicans after the GOP blocked a bipartisan border measure earlier this year. Some Harris campaign officials remain concerned about the gap in polling, which shows Trump holding a lead on...