Venezuelan migrants near the Simon Bolivar International Bridge plead for people to support them with food and water so they can continue protesting in La Parada near Cucuta, Colombia, Sunday, Feb. 24, 2019, on the border with Venezuela. A U.S.-backed drive to deliver foreign aid to Venezuela on Saturday met strong resistance as troops loyal to President Nicolas Maduro blocked the convoys at the border and fired tear gas on protesters. (AP Photo/Fernando Vergara)