Ex-rebel frontrunner in Colombian vote, could shake US ties


              A supporter of Historical Pact coalition presidential candidate Gustavo Petro, holds a flag with the image of Petro before a closing campaign rally in Zipaquira, Colombia, Sunday, May 22, 2022. Elections are set for May 29. (AP Photo/Fernando Vergara)
            
              Federico Gutierrez, presidential candidate representing the Team for Colombia coalition, greets his supporters during a closing campaign rally in Medellin, Colombia, Sunday, May 22, 2022. Elections are set for May 29. (AP Photo/Jaime Saldarriaga)
            
              Gustavo Petro, presidential candidate with the Historical Pact coalition, embraces his former school teacher Salvador Medina, during a closing campaign rally in Zipaquira, Colombia, Sunday, May 22, 2022. Elections are set for May 29. (AP Photo/Fernando Vergara)
            
              Supporters of Historical Pact coalition presidential candidate Gustavo Petro, attend a campaign rally in Medellin, Colombia, Friday, May 20, 2022. (AP Photo/Jaime Saldarriaga)
            
              Federico Gutierrez, presidential candidate representing the Team for Colombia coalition, talks to his supporters during a closing campaign rally in Medellin, Colombia, Sunday, May 22, 2022. Elections are set for May 29. (AP Photo/Jaime Saldarriaga)
            
              Presidential candidate Gustavo Petro of the Historical Pact coalition, left, Federico Gutierrez, presidential candidate representing the Team for Colombia coalition, second left, and Hope Coalition presidential candidate Sergio Fajardo, right, take part in a presidential debate at the El Tiempo newspaper in Bogota, Colombia, Monday, May 23, 2022, ahead of the first round May 29th elections. (AP Photo/Fernando Vergara)
            
              People walk past a campaign mural of presidential candidate Rodolfo Hernandez, with the Anti-corruption Governors League, in Bogota, Colombia, Friday, May 20, 2022. Elections are set for May 29. (AP Photo/Fernando Vergara)
            
              Federico Gutierrez, presidential candidate representing the Team for Colombia coalition, gestures during a presidential debate at the El Tiempo newspaper building in Bogota, Colombia, Monday, May 23, 2022, ahead of the first round May 29th elections. (AP Photo/Fernando Vergara)
            
              Presidential candidate Gustavo Petro, with the Historical Pact coalition, touches his forehead during a presidential debate held at the El Tiempo newspaper building in Bogota, Colombia, Monday, May 23, 2022, ahead of first round May 29th elections. (AP Photo/Fernando Vergara)
            
              Federico Gutierrez, presidential candidate representing the Team for Colombia coalition, right, and presidential candidate Gustavo Petro with the Historical Pact coalition, left, take part in a presidential debate at the El Tiempo newspaper building in Bogota, Colombia, Monday, May 23, 2022, ahead of the first round May 29th elections. (AP Photo/Fernando Vergara)
            
              A police officer walks past posters of Historical Pact coalition presidential candidate Gustavo Petro and his running mate Francia Marquez during a closing campaign rally in Zipaquira, Colombia, Sunday, May 22, 2022. Elections are set for May 29. (AP Photo/Fernando Vergara)