Venezuelans confront national policemen demanding them to let the humanitarian aid in, at the Simon Bolivar bridge, in Cucuta, Colombia after President Nicolas Maduro's government ordered to temporary close down the border with Colombia on February 23, 2019. - Venezuela braced for a showdown between the military and regime opponents at the Colombian border on Saturday, when self-declared acting president Juan Guaido has vowed humanitarian aid would enter his country despite a blockade. (Photo by Luis ROBAYO / AFP)