Brian Levitt, OppenheimerFunds Senior Investment Strategist, says a trade war could lead to a stronger dollar. Elizabeth Economy, CFR Senior Fellow & Author of "The Third Revolution", says tariffs are good for shock value but past that, they don't do much. And Bloomberg's Senior Executive Editor for Economics Stephanie Flanders hosts a panel of central bankers in Sintra, Portugal. We hear from ECB President Mario Draghi and Fed Chairman Jerome Powell.