Ms Smith declared: "We face a choice here. We can either sit on our hands, failing to recognise where there is a broad consensus that this is a risk that is growing and that we might well face in the future.
"We can risk having to legislate in an emergency in the future, we can risk, as some people believe we should do, having to declare a national emergency in order to be able to do it.
"Or we can legislate now - with the discussion that will be put in Parliament on the safeguards and on the circumstances in which it would be used - and have that available in the future," she said.
But Britain's Labour government faces a tough sell. The BBC notes that the Liberal Democrats are opposed to the new bill, and feel they're echoing the public mood. And in an interview with The Times of London, Conservative Party leader David Cameron accused Prime Minister Gordon Brown of using the ant-terror bill to tar Labour's political opposition.
"I am afraid that he sees this as a totally political weapon: let us try and make the Tories look soft on terror. That is my problem with our Prime Minister: he looks at every single issue from the point of view of what is the right dividing line that divides me from my opponent, not what is right for the country, and I think that is what he is doing here."