US Senators slammed Amazon Web Services for refusing to testify at a hearing about the SolarWinds intrusion given the public cloud giant’s infrastructure was used in the attack. “We had extended an invitation to Amazon to participate. The operation we’ll be discussing today uses their infrastructure, [and], at least in part, required it to be successful,” Sen. Marco Rubio, R-Fla., said during a Senate Intelligence Committee hearing Tuesday. “Apparently they were too busy to discuss that here with us today, and I hope they’ll reconsider that in the future.” Specifically, Amazon Web Services hosted most of the secondary command and control nodes in the SolarWinds attack, said Sen. Richard Burr, R-N.C. And all of AWS’s infrastructure was inside the United States, Burr said. This is one of the first times AWS’s role in the SolarWinds attack has been publicly discussed, with much of the scrutiny to date focused on top AWS cloud computing rival Microsoft.