CUCUTA, Colombia (AP) — Trucks carrying U.S. humanitarian aid destined for Venezuela arrived Thursday at the Colombian border, where opposition leaders vowed to bring them into their troubled nation despite objections from embattled President Nicolas Maduro.

Two semi-trailers loaded with boxed emergency food and medicine rolled into the Colombian border city of Cucuta, which is just across the river from Venezuela.

"The United States is prepositioning relief items — including food, nutritional supplements, hygiene kits and medical supplies — in Colombia so they are available to reach those mos...