A whistleblower organization has initiated a court action to force the Department of Justice to disclose why it spied on congressional staff, setting up a landmark legal battle on an issue that has rankled both Republicans and Democrats.Last fall, several current and former congressional oversight staff were belatedly informed that the Justice Department seized phone and email records in 2017 in an internal investigation, raising concerns about separation of powers between two branches of government.Jason Foster, who is now the founder and chair of Empower Oversight, the group which sued in court this week to unseal the court documents in...