US Ambassador to the United Nations Nikki Haley defends Ivanka Trump after she caused an international stir by sitting in for her father during a meeting with world leaders at the G20 summit this past week.Appearing on CBS' Face the Nation, Haley said, "I think she sees herself as part of a public servant family, and she doesn't want to waste this time by not putting forward some effort to try and help the world." On Saturday, Ivanka briefly sat in her father's chair during a session on African development, as the World Bank president spoke.Her appearance triggered a flurry of tweets and caught the attention of mass-circulation daily Bild, which carried a photograph of her on its website with the headline: "Trump's replacement: Ivanka Trump suddenly appears at negotiating table." German Chancellor Angela Merkel, who has worked with Ivanka on related issues, dismissed the kerfuffle at a news conference after the G20 summit ended."The delegations decide who will sit at the table if the president isn't there, which can happen from time to time. And Ivanka belongs to the U.S. delegation," Merkel said, noting other delegations do the same thing."It's well known that she works in the White House and is responsible for several initiatives," Merkel said.