Narayana Kocherlakota, a Bloomberg View columnist and former president of the Federal Reserve Bank of Minneapolis, says it would be hard for Trump to say that Janet Yellen hasn't done her job. Prior to that, Michael Darda, MKM Partners' chief economist, says the Fed's on course for quarter-to-quarter rate hikes. Ken Leon, CFRA Research's director of industry and equities, says JPMorgan didn't exhibit its normal across-the-board strength in earnings. Finally, Emmanuel Kachikwu, Nigeria's oil minister, says OPEC is struggling with U.S. production increases.