There is a "strong case" for raising interest rates when Federal Reserve policymakers meet next month, as long as U.S. economic data does not disappoint, a top Fed official said on Saturday.<br />"The data I think have been overall encouraging, especially on the labor market," San Francisco Fed President John Williams told reporters after a conference at University of California Berkeley's Clausen Center.<br />"Assuming that we continue to get good data on the economy, continue to get signs that we are moving closer to achieving our goals and gaining confidence getting back to 2-percent inflation... If that continues to happen there's a strong case to be made in December to raise rates."