(Reuters) - Oil futures slipped below USD 118 a barrel after a breakdown of budget talks in the Congress over the weekend helped drive investors away from volatile and risky assets on Monday.
Worries about a U.S. credit rating downgrade or even default curbed optimism about global economic growth, after last week's preliminary solution to the euro zone debt crisis helped propel Brent to as high as USD 118.80 a barrel on Friday.
Brent crude for September was 80 cents lower at USD 117.87 a barrel at 0940 GMT, after falling by more that USD 1 earlier in the session.
U.S. oil was 57 cents lower at USD 99.30, paring losses of more than USD 1 but off a six-week high of USD 99.87 on Friday.