Novembe 15 -- Former European Commission President Jose Barroso, who is now an adviser to Goldman Sachs Group Inc., shares his views with Bloomberg's Manus Cranny on populism in Europe and how to combat it. “Just speak to the people and be able to understand what the concerns of the people are. What we have seen so far is mainstream forces in Europe, central left, central right, have not been able to articulate answers,” he said. Barroso urged Trump to recommit the U.S. to NATO as a matter of urgency, and suggested a NATO summit early next year to ally the concern in countries including the Baltic states and Poland that the U.S. under Trump might be closer to Russia. Barroso also commented on Brexit negotiations before the German elections.