London Mayor Sadiq Khan has said that he had five armed police officers protecting him outside the ITV studio while appearing on Good Morning Britain.
The 51-year-old told hosts Susanna Reid and Richard Madeley that it "isn't safe" for MPs at the moment and warned that politicians needed to be aware of the effect that words have.
It comes after Sir Keir Starmer and Shadow Foreign Secretary David Lammy were mobbed by anti-vax protestors falsely accusing the Labour leader of "protecting" paedophile Jimmy Savile.
Last week, Boris Johnson made an incorrect Jimmy Savile slur against Sir Keir in the House Of Commons, which has since been condemned by Labour MPs and Tory backbenchers alike.
On Tuesday, Commons Speaker Sir Lindsay Hoyle tore into Johnson - warning "our words have consequences".
In a statement to MPs, Sir Lindsay said the Prime Minister's words in the Commons last week were "inappropriate" and said it was unacceptable to use language under privilege that could "inflame opinions".
As Mr Khan appeared on GMB, Susanna asked: "Sadiq Khan, just one last one - is it safe for politicians to walk around the streets of London right now?"
"No," he replied firmly. "I've got, outside this studio, five police officers - all armed - keeping me safe because of threats to my life. Keir Starmer and David Lammy were walking from the Ministry of Defence briefing about Ukraine walking back to their offices in parliament. They were threatened.
"One of the officers protecting Keir Starmer was one of my police protection officers. It shouldn't be the norm that politicians have protection to look after them. By the way, I think words have consequences and when you're on the dispatch box in the House of Commons.
"When you're the prime minister and you are normalising conspiracy theories, not only are you distracting from serious allegations of you yourself breaking the law with bringing your own booze, but also you are normalising far right theories and endangering the lives of not only politicians that are alive now, we know I'm afraid Sir David Amess and a dear friend of mine Jo Cox lost their lives. Another dear friend - Steven Timms - almost lost his life as a result of stabbings. We should be cognizant of the consequences of our words."
He added: "I don't want to live in a society, Susanna, where I can't mix and mingle with ordinary Londoners. If we get to that stage, I think we'll rue it."
*Good Morning Britain airs weekdays at 6am on ITV
