US Secretary of State Mike Pompeo says his country will take additional measures in support of Venezuela's opposition leader Juan Guaidó, BBC reports.
Mr Pompeo called on other countries to co-operate in efforts to remove President Nicolás Maduro from office.
Mr Guaidó travelled to Colombia to meet Mr Pompeo on the sidelines of a regional conference.
This is the second time he has defied a travel ban imposed by Venezuela's pro-government Supreme Court.
Despite international pressure and US sanctions on the crucial oil sector, Mr Maduro has managed to stay in power, supported by Russia, Cuba and a handful of other countries as well as the powerful Venezuelan military.