British Prime Minister Theresa May said on Monday she was proud of the country's healthcare system, responding to comments by U.S. President Donald Trump who tweeted that the service was "going broke and not working."
"The prime minister is proud of having an NHS that is free at the point of delivery. NHS funding is at a record high and was prioritized in the budget with an extra 2.8 billion pounds ($3.9 billion)," the spokesman told reporters.
"In the recent the Commonwealth Fund international survey the NHS was rated the best in the world for a second time.
Trump drew a fierce reaction from angry Britons, including Health Minister Jeremy Hunt, after criticizing Britain's publicly funded National Health Service.
Trump used the NHS to make a domestic political point arguing against the provision of universal healthcare, but in doing so was perceived to have bad-mouthed a system held dear by his country's closest ally.
"The Democrats are pushing for Universal HealthCare while thousands of people are marching in the U.K. because their U system is going broke and not working. Dems want to greatly raise taxes for really bad and non-personal medical care. No thanks!" Trump tweeted.
Britain's health system delivers free care for all. It is typically one of the most important issues for voters during elections and often regarded as a weakness for May's Conservative, or Tory, Party, whose opponents accuse the government of inadequately investing in it.
Twitter users flooded to defend the NHS, with many pointing out that the march Trump referred to was organized by groups that want to increase the health service's funding, not dismantle it.
The rally drew 60,000 people to central London on Saturday according to one of its organizers, Health Campaigns Together. Protesters demanding more funding for the service marched on Prime Minister May's office.
Even Health Secretary Hunt, one of the main targets of the protesters' anger, snapped back sharply at Trump.
"I may disagree with claims made on that march but not ONE of them wants to live in a system where 28 (million) people have no cover. NHS may have challenges but I'm proud to be from the country that invented universal coverage — where all get care no matter the size of their bank balance," said Hunt.
Opposition Labour Party leader Jeremy Corbyn tweeted back to Trump: "Wrong. People were marching because we love our NHS and hate what the Tories are doing to it. Healthcare is a human right."
According to the World Bank, Britain spends 9.1 percent of its GDP on health care, compared to 17.1 percent in the United States. Average British life expectancy is 81.6 years, nearly three years longer than in the United States.
Last month, May apologized after the health service postponed tens of thousands of non-emergency operations to free up staff and beds to deal with emergency patients.
Trump's latest Twitter outburst against Britain comes only a week after he offered to apologize for a row triggered last year by his reposting of anti-Muslim videos originally posted by a leader of a British far-right fringe group.
He also drew scorn from across the British political spectrum last year for criticizing the mayor of London after attackers drove a van into a crowd and stabbed people near London Bridge, killing eight.
May was the first international leader to visit Trump in Washington after his inauguration last year and has given him an invitation on behalf of Queen Elizabeth for a state visit. Trump was due in London to open a new U.S. embassy building this month but canceled the visit.