WASHINGTON (AP) — Border officials are aiming to more than quadruple the number of asylum seekers sent back over the southern border each day, a major expansion of a top government effort to address the swelling number of Central Americans arriving in the country, a Trump administration official said Saturday.

It was the latest attempt to ease a straining immigration system that officials say is at the breaking point. Hundreds of officers who usually screen cargo and vehicles at ports of entry were reassigned to help manage migrants. Homeland Security Secretary Kirstjen Nielsen asked for volun...