LONDON (Reuters) - Oil prices fell on Wednesday after U.S. president Donald Trump said he was working on a strong response to China's proposed security law in Hong Kong.A potential deterioration in relations between the world's two biggest economies could ratchet up the pressure on global businesses and oil demand already weakened by the coronavirus pandemic.Brent crude fell 45 cents, or 1.2%, to $35.72 a barrel by 0906 GMT and U.S. West Texas Intermediate (WTI) crude was down 26 cents, or..