BOGOTA — U.S.-backed Venezuelan leader Delcy Rodriguez will make her first foreign trip as interim president later this month, attending a summit in Colombia, officials in Bogota told AFP Thursday. The meeting with Colombian President Gustavo Petro will take place in a border town on March 13, the president's office in Bogota said. The meeting will mark a thaw in relations between the two countries. Colombia has not recognised the legitimacy of elections that returned Rodriguez's allies to power. And the border area is home to numerous drug-running left-wing guerrilla groups, which Colombia has accused Venezuela of funding and protecting. But since Nicolas Maduro was captured by U.S. forces and spirited to the United States to face trial in January, Rodriguez has haltingly embarked on a series of U.S.-backed reforms. She has opened Venezuela's vast oil industry to foreign investment, sacked officials suspected of corruption, and released scores of political prisoners. But the security forces retain an iron grip on power. Some 600 political prisoners remain behind bars throughout the countr