By Demetri Sevastopulo,Anjli Raval in Washington, in London
President Donald Trump on Tuesday took aim at Saudi Arabia and its refusal to lead an increase in oil production, telling the UN that Opec members were “as usual ripping off the rest of the world”.Speaking at the UN General Assembly in New York, Mr Trump told Opec that the US was “not going to put up with . . . these horrible prices much longer”. His warning came in a speech to the international body in which the US president also urged other countries to help squeeze the regime in Tehran by cutting oil imports from Iran.