Tourists from dozens of countries including the UK could be asked to provide a five-year social media history as a condition of entry to the United States, under a new proposal unveiled by American officials.

The new condition would affect people from dozens of countries who are eligible to visit the US for 90 days without a visa, as long as they have filled out an Electronic System for Travel Authorization (ESTA) form.

Since returning to the White House in January, President Donald Trump has moved to toughen US borders more generally - citing national security as a key reason.

Analysts say the new plan could pose an obstacle to potential visitors, or harm their digital rights.

The US expects a major influx of foreign tourists next year, as it hosts the men's football World Cup alongside Canada and Mexico, and for the 2028 Olympics in Los Angeles.

The proposal document was filed by Customs and Border Protection (CBP) and the Department of Homeland Security (DHS), of which the agency is part.

US media reported that it appeared in the Federal Register, which is the official journal of the US government. The BBC has asked DHS for comment.

The proposal says "the data element will require ESTA applicants to provide their social media from the last 5 years", without giving further details of which specific information will be required.

The existing ESTA requires a comparatively limited amount of information from travellers, as well as a one-off payment of $40 (£30). It is accessible to citizens of about 40 countries - including the UK, Ireland, France, Australia and Japan - and allows them to visit the US multiple times during a two-year period.

As well as the collection of social media information, the new document proposes the gathering of an applicant's telephone numbers and email addresses used over the last five and 10 years respectively, and more information about their family members.

The text cites an executive order from Trump in January, titled "Protecting the United States From Foreign Terrorists and Other National Security and Public Safety Threats".

The Trump administration has previously required foreign nationals to make their social media accounts public if they are applying for student visas or H1B visas for skilled workers - the latter of which now also entail a much higher fee.

A senior state department official said of the student visa policy: "It is an expectation from American citizens that their government will make every effort to make our country safer, and that is exactly what the Trump Administration is doing every single day."

Officers were instructed to screen for those "who advocate for, aid, or support designated foreign terrorists and other threats to national security; or who perpetrate unlawful anti-Semitic harassment or violence".

As part of the administration's broader effort to toughen borders, officials recently said an existing travel ban - affecting 19 countries in Africa, the Middle East and the Caribbean - could soon be expanded.

That move was announced in the wake of a shooting attack on two National Guard members in Washington DC, in which an Afghan man has been named as the suspect.

The new proposal regarding ESTA data collection for tourists invites views from the public for 60 days.

Sophia Cope, of digital rights organisation the Electronic Frontier Foundation, criticised the plan, telling the New York Times that it could "exacerbate civil liberties harms".

Meanwhile, immigration law practice Fragomen suggested there could be practical impacts as applicants could face longer waits for ESTA approvals.

Experts have previously suggested that the changes to travel policies introduced under Trump have had an impact on the American tourism industry.

Earlier this year, the World Travel & Tourism Council said the US was the only one of 184 economies that it analysed that was expected to see a decline in international visitor spending in 2025.

Other Trump administration policies have also appeared to impact tourism to the country, such as many Canadians boycotting US travel as a form of protest against Trump's tariffs.

October marked the 10th straight month of decline in the number of Canadian travellers to the US. In the past, Canadians have made up about a quarter of all international visitors to the US, spending more than $20bn (£15.1bn) a year, according to the US Travel Association.