The one-day visit, at the invitation of the chancellor, gives Merkel and other officials face-to-face access with the influential daughter of President Donald Trump at a time when world leaders are still trying to discern where his policies will lead. Trump and Merkel are part of a panel discussion Tuesday at the W20 Summit, a women-focused effort within the Group of 20 countries, entitled Inspiring women: Ahead of the trip, Ivanka Trump co-authored an op-ed piece in the Financial Times, calling for more global efforts to invest in women's economic empowerment. [...] a senior administration official says she and others have been working quietly behind the scenes to revise her campaign proposals and to build momentum.