By Sukriti Gupta and Noel Randewich (Reuters) -Wall Street indexes were mixed on Tuesday as investors digested mostly positive quarterly results from big U.S. banks, comments from Federal Reserve Chair Jerome Powell and an ongoing U.S.-China trade war. A slew of major lenders reported solid results on strong performance in the investment banking segment, helping the S&P 500 banking index rally 2%. Wells Fargo surged 8.4% and was on track for its best day in six months and Citigroup jumped 4.6% after both lenders beat estimates for third-quarter profit. JPMorgan Chase raised its full-year forecast for net interest income and Goldman Sachs beat Wall Street expectations for quarterly profit. However, shares of both JPMorgan and Goldman Sachs, which have outperformed most rivals this year, fel

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