The U.S. government, and America’s largest companies, are scrambling to understand and protect against the “grave risk” to American security from a massive hack that Secretary of State Mike Pompeo now says was a Kremlin op. President Trump’s public response: Mostly silence…

The only way to be sure a network is clean is “to burn it down to the ground and rebuild it,” said Dmitri Alperovitch, co-founder of the leading cybersecurity firm CrowdStrike. “Cleanup is just phase one.”…

Jeremy Bash of Beacon Global Strategies — former Pentagon and CIA chief of staff — said on MSNBC that the hackers “poisoned our own medicine.”

Bash told Andrea Mitchell: “[T]hey’re going to be reading the emails of the I.T. and security professionals who’re responsible for kicking the Russians out.”