Reuters exclusively reported that the world’s No. 2 insurance broker Aon will face a list of objections by the EU’s antitrust watchdog, which it must overcome with concessions to proceed with its $30 billion bid for No. 3 player Willis Towers Watson. The negotiations may derail Aon’s goal of closing the deal in the first half of the year unless it offers concessions in the coming weeks to stave off the charge sheet, Reuters sources said. The deal, announced a year ago, would create the world’s largest insurance broker, putting the merged entity ahead of Marsh & McLennan Companies Inc.