Crude oil prices edged lower despite scheduled US-China trade talks.Brent oil futures were at $66.41, down by 0.09%, and WTI crude oil futures were at $64.54, down by 0.06%.Chinese President Xi Jinping asked US President Donald Trump to ease trade measures during a phone call.US-China negotiators to meet in London to discuss tariff rollbacks, export controls, and other trade issues.