Watch: Fireworks At UN As Cuba Disrupts US Ambassador's Speech: "You're A Liar, Mr Waltz!" A UN General Assembly this week devolved into a high-charged shouting match amid procedural disruptions and chaos, after US Ambassador to the UN Mike Waltz told the global forum on Tuesday that there is no American blockade on Cuba . Havana didn't take the bait quietly, given Cuba's Foreign Minister Bruno Rodríguez immediately shot back at Waltz - who is a former Army Green Beret: "This is the United Nati