Mr Guaidó has called on other nations to consider "all measures" to oust Mr Maduro after opposition-led efforts to bring in aid descended into clashes. He also said he would attend a meeting of mostly Latin American countries in Colombia on Monday, despite being under a travel ban imposed by Mr Maduro. US Vice-President Mike Pence will represent Washington at the talks in Bogota. A senior White House official said on Sunday that Mr Pence was planning to announce "concrete steps" and "actions" in addressing the crisis at the talks on Monday, Reuters news agency reported. Meanwhile, Colombia and Brazil said they would intensify pressure on Mr Maduro to relinquish power. US President Donald Trump has not ruled out an armed response to the Venezuela crisis. Visit Site.