ALEXANDRIA, Virginia — A current FBI special agent and a former bureau analyst who both served on Robert Mueller’s team testified that the special counsel’s office declined to investigate and never interviewed Charles Dolan, the Clinton-allied business associate of the main source for Christopher Steele, despite their urging. Supervisory special agent Amy Anderson and former FBI intelligence analyst Brittany Hertzog both testified Friday that, as members of Mueller’s team who were specifically tasked with scrutinizing the allegations within the Trump dossier, they believed the FBI should interview and further investigate Dolan, a longtime ally of Bill and Hillary Clinton, partly...