Colombia's leftist President Gustavo Petro joins his supporters in Bogota, telling them that a corrupt "oligarchy" has "betrayed the Colombian people, for greed and for money." Thousands marched through Colombia urging Congress to adopt Petro's reforms, as the president lacks the necessary majority to push them through. The protesters are advocating for reforms to the labor and health systems, which are central to the agenda of Colombia's first left-wing government. IMAGES AND SOUNDBITES