House Republicans are expanding their investigation of the Trump dossier, seeking answers from Obama administration officials including a former staffer for Vice President Joe Biden whose husband works for the firm behind the controversial document, Fox News has learned. A source familiar with the matter confirmed to Fox News that Shailagh Murray, who was Biden's former deputy chief of staff and communications director before serving as a senior adviser to President Obama, will be sent a questionnaire Friday. The questionnaire, from Republican Chairman Devin Nunes of the House Permanent Select Committee on Intelligence, will ask when Murray became aware that...