Special Counsel Robert Mueller is continuing to use a controversial 35-page dossier financed by the Democratic National Committee and the 2016 Hillary Clinton campaign as a "road map” for investigative leads, sources familiar with his investigation say. Mueller’s team has also used information gleaned from surveillance court-approved wiretaps on former Trump adviser Carter Page that were secured by citing material in the dossier, the sources say. And a detail previously reported last fall – that Mueller’s investigators traveled overseas last year to debrief the dossier’s London-based author, Christopher Steele, a former British spy – takes on a new cast with...