London — Oil slid to about $66 a barrel on Thursday, pressured by concerns over whether the Group of 20 (G20) summit will produce a breakthrough on trade and perceptions that supply is ample despite the prospect of continued Opec curbs.

US President Donald Trump said on Wednesday that a trade deal with Chinese President Xi Jinping was possible this weekend but that he was prepared to impose US tariffs on most remaining Chinese imports if the two countries did not agree.

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