Los Angeles police said they arrested several people Friday afternoon during an immigration protest in Santa Monica, after the protesters blocked an intersection along President Barack Obama’s motorcade route. The protest at the corner of San Vicente Blvd. and 26th St. was organized by immigrant advocacy groups, who planned it to coincide with a nearby fundraiser attended by Obama during his visit to Los Angeles. A similar protest occurred in Chicago last week near an event at which the president was scheduled to speak. Both protests are part of a national campaign being waged by immigrant activists to persuade the White House to halt deportations while an immigration overhaul is being debated in Congress.