The World Economic Forum event at Davos from Jan. 21 to Jan. 24 could be pivotal for U.S.-EU relations. President Donald Trump’s keynote on Tuesday will likely focus on recent deals with China, Japan and South Korea as well as the signing of USMCA, but could also set the tone for dealings with the EU. A meeting between EU Commissioner Hogan and U.S. Trade Representative Lighthizer last week did not appear to have provided a reboot to relations while meetings between Treasury Secretary Mnuchin and Finance Minister Le Maire this week will show whether the digital services tax issue will be...