Last year, Lieberman argued the bill was necessary to "preserve those networks and assets and our country and protect our people".
He said that, for all its allure, the internet could also be a "dangerous place with electronic pipelines that run directly into everything from our personal bank accounts to key infrastructure to government and industrial secrets".
US economic security, national security and public safety were now all at risk from new kinds of enemies, including "cyber warriors, cyber spies, cyber terrorists and cyber criminals".
The internet is a dangerous place ... US Senator Joe Lieberman. Photo: AP
Although the bill was targetted at protecting the US, many have said it would also affect other nations.
One of Australia's top communications experts, University of Sydney associate professor Bjorn Landfeldt, had previously railed against the idea, saying shutting down the internet would "inflict an enormous damage on the entire world".
He said it would be like giving a single country "the right to poison the atmosphere, or poison the ocean".
The scale of Egypt's crackdown on the internet and mobile phones amid deadly protests against the rule of President Hosni Mubarak is unprecedented in the history of the web, experts have said.