May's comments, which came just two days before the 2017 general election, were criticized by Opposition politicians as an attempt to revive her "lacklustre, flagging election campaign".
With Britain still reeling from two attacks in London and one in Manchester, May seemed determined to show voters she will respond to the terror threat if she wins the election Thursday, Xinhua reported.
The prime minister's intervention came after days of tough questioning from politicians and the press about how cuts to police numbers she made as Home Secretary have made it more hard to protect Britain's streets and uproot radicalisation at community-level.
The criticism came after Ms May, on the campaign stump last night, suddenly announced she would not allow human rights laws to stand in the way of preventing jihadis carrying out atrocities in Britain.
"We should have longer prison sentences for people convicted of terrorist offences". She wants it to be made easier for authorities to deport foreign terror suspects, to do more to restrict their freedoms.
Seeking to shore up her domestic security credentials, May said Tuesday more should be done "to restrict the freedom and movement of terrorist suspects when we have enough evidence to know they are a threat but not evidence to prosecute them in full in court, and if our human rights laws stop us from doing it, we'll change the laws so we can do it".
"And if human rights laws stop us from doing it, we will change those laws so we can do it". "Certainly the Labour Party had a three line whip on it, and I led for that on it and we worked with the Prime Minister to ensure..."
In the wake of three suspected terrorist attacks in less than three months in the United Kingdom, British Prime Minister Theresa May has issued a number of powerful statements, indicating stringent security measures. "We have to protect our basic freedoms, our basic democracy and our human rights", he said.
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"And responsibility for that lies squarely with Theresa May and her dereliction of duty".
"In her years as home secretary she was willing to offer up the police for cut after cut".
Liberal Democrat leader Tim Farron accused Mrs May of launching a "nuclear arms race" on terror laws and claimed she was "simply posturing about being tough on terror".
"It might give the appearance of action, but what the security services lack is not more power, but more resources".
"If Theresa May does what she threatens, she will go down in history as the Prime Minister who handed terrorists their greatest victory".
Khuram Butt, the alleged ringleader of the London attack, was well known to police and intensely investigated, raising questions over whether enough was done to prevent it.
Earlier, the Labour mayor of London Sadiq Khan said the Metropolitan Police force was facing the loss of between 3,400 and 12,800 officers - up to 40% of its strength - under Conservative spending plans.
Labour leader Jeremy Corbyn on Monday called on May to quit, pointing to the loss of 20,000 police jobs, mostly during her six years as interior minister under David Cameron. "More I'm clear: if human rights laws get in the way of tackling extremism and terrorism, we will change those laws to keep British people safe", May wrote as the caption of the video.