British lawmakers returned to Parliament on Monday and gave moving tributes to the murdered colleague Jo Cox.
Cox'S shocking killing last week has focused international attention on the country's crucial referendum on whether to leave the European Union.
Parliament has been in recess ahead of this week's national vote on leaving the EU. But in a rare move, members of Parliament were recalled Monday to pay their respects in the House of Commons to the 41-year-old Labour politician, who was fatally shot and stabbed Thursday in Bristol in northern England.
Cox was a rising star of her party who was a vocal advocate of Britain remaining in the EU. The man accused of killing her appeared in a London court Monday via video link.
Tommy Mair, 52, spoke only to confirm his name and was remanded into custody until Thursday. When he first appeared in court Saturday charged with murder and other offenses, Mair told the judge: "My name is death to traitors, freedom for Britain."
Both the "Leave" and "Remain" campaigns, which have been neck and neck in the polls, held rival rallies in London. Cameron, who has led the campaign to remain, restated his case to the nation Sunday night on the BBC's "Question Time."
"Let's be clear if we do leave, that's it," Cameron said. "We are walking out the door, we're quitting and we are giving up on this organization, which, even if we leave, will have a huge effect on our lives, on our children, on our opportunities, on our businesses, and I don't think Britain in the end is a quitter -- I think we stay and fight."
Britain's Sunday Telegraph newspaper published an article Sunday by Cameron in which he warned a vote for "Brexit" would leave Britain a "permanently poorer country in every sense" and reduce its global influence.
Pro-"Remain" demonstrators spell out the word "In" Sunday in London's Hyde Park. "If we vote Remain, we stay locked in the back of the car, driven by someone with an imperfect command of English, and going a direction we don't want to go," he wrote.
"The Remainers are now desperately trying to suggest that anyone who wants to Leave is somehow against the spirit of modern Britain; against openness, tolerance, decency. What nonsense -- and what an insult to the people of all races and parties and ages and beliefs who simply want to take back control of this country's democracy."
The British pound rallied strongly Monday following a series of opinion polls that suggested momentum may be swinging in the direction of a "Remain" vote. Economists have warned that voting to leave the EU could cause enduring damage to Britain's economy.
But polling has consistently shown voters sharply divided on the issue, with a significant group undecided. Observers have cautioned against setting too much store in the opinion polls after they proved inaccurate in predicting the outcomes of recent votes.
It remains to be seen how the killing of Cox - a highly regarded lawmaker who campaigned for Britain to stay in the EU - will affect the final days of the referendum campaign.