Sens. Mark Warner and Marco Rubio call for designation of leader of four-Agency Effort to investigate SolarWinds cyberattack. Cybersecurity experts say having a point person for the investigation might help clarify what happened in the attack. Experts say the investigation is now at a stage in which coordination, rather than discovery, is now the main priority. The cyberattack was likely a cyberespionage operation conducted by a hacking group with ties to Russia, experts say. The federal government should create a National Cybersecurity Safety Board to investigate cyber incidents.”]