Abby Joseph Cohen, Goldman Sachs Advisory Director & Senior Investment Strategist, thinks the risk tolerance of investors has changed. Bill Lee, Milken Institute Chief Economist, says the Fed still has to define what they mean by "asymmetry." John Hudak, Brookings Governance Studies Senior Fellow, says General Mattis' resignation is connected to the "unstable behavior" and "erratic decision-making" of Trump. Stephen Gallo, BMO Capital Markets Head of European FX Strategy, expects the dollar to be stronger the first half of 2019.