"The United States remains committed to holding accountable those responsible for Venezuela's tragic decline and will continue to use the full sweep of its diplomatic and economic tools to support interim president Juan Guaido, the National Assembly and the Venezuelan people's effort to restore their democracy," Cynthia Plath, deputy U.S. ambassador, said.

Venezuela's ambassador Jorge Valero said that the Trump administration was preparing a "military invasion" of his country and questioned whether Washington had the moral authority to "impose a diktat" on Caracas. Plath walked out of the conference during his comments, then returned.

(Reporting by Stephanie Nebehay; Editing by Andrew Heavens)