But assessing the damage done, the lessons learned from the Russian action and the response is a slow process. Mr. Biden, aides say, does not want to risk even greater escalation with Mr. Putin. And it is not yet clear that the attack is over, or will be limited to the theft of communications.
After briefings on the issue, Mr. Warner and Mr. Rubio wrote that “the threat our country still faces from this incident needs clear leadership to develop and guide a unified strategy for recovery, in particular a leader who has the authority to coordinate the response, set priorities, and direct resources to where they are needed.”
Ms. Neuberger’s efforts are focused on directing agencies hit by the Russian intrusion to patch and repair their networks, examine the government’s response to the episode and work with the private sector. She is also overseeing a study of the longer-term implications of the attack on the “supply chain” of software, Ms. Horne said.
The White House has also charged the Office of the Director of National Intelligence to conduct an assessment of the SolarWinds hacking, work that is continuing.
Mr. Warner has pledged to hold public hearings on the intrusion to help better understand what happened.
In an interview last week, before the letter was sent, Mr. Warner said he was disturbed that FireEye, a leading cybersecurity company, not the network of sensors monitored by the National Security Agency, had discovered the SolarWinds intrusion. The agency has said nothing publicly about why those signals were missed.
“I would like to err much more on the side of public discussion,” Mr. Warner said last week.
Dmitri Alperovitch, a cybersecurity expert who was the co-founder of CrowdStrike and now runs the Silverado Policy Accelerator, a think tank, told the House Homeland Security Committee on Wednesday that the SolarWinds intrusion had the most impact of any cyberattack in American history. The hack has made clear “serious gaps” in U.S. strategy.