President Donald Trump's administration has disbanded an FBI task force focused on investigating foreign influence campaigns and placed on leave several election security employees at the U.S. Cybersecurity and Infrastructure Agency.

The intrusion was stark evidence of the vulnerability of even supposedly secure government networks, even after well-known previous attacks. U.S. authorities acknowledged that federal agencies were affected by the breach on Sunday, providing few details. The national cybersecurity agencies of Britain and Ireland issued similar alerts. SolarWinds is used by hundreds of thousands of organizations around the world, including most Fortune 500 companies and multiple U.S. federal agencies. “It’s obviously incredibly significant and widespread,” said Chris Painter, who coordinated cyber-policy at the State Department during the Obama administration.